| Base | Representation |
|---|---|
| bin | 1100111000001001110… |
| … | …0100011011110100000 |
| 3 | 210011001000202200211200 |
| 4 | 3032002130203132200 |
| 5 | 12111040323334040 |
| 6 | 245344342241200 |
| 7 | 21661221513264 |
| oct | 3160234433640 |
| 9 | 704030680750 |
| 10 | 221231855520 |
| 11 | 85907684535 |
| 12 | 36a62126200 |
| 13 | 17b28c929b0 |
| 14 | a9c9c2a0a4 |
| 15 | 5b4c41e630 |
| hex | 33827237a0 |
221231855520 has 576 divisors, whose sum is σ = 863991352224. Its totient is φ = 51066961920.
The previous prime is 221231855519. The next prime is 221231855527. The reversal of 221231855520 is 25558132122.
221231855520 is a `hidden beast` number, since 2 + 2 + 1 + 23 + 1 + 85 + 552 + 0 = 666.
It can be written as a sum of positive squares in 16 ways, for example, as 34715664 + 221197139856 = 5892^2 + 470316^2 .
It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is not an unprimeable number, because it can be changed into a prime (221231855527) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 99608010 + ... + 99610230.
Almost surely, 2221231855520 is an apocalyptic number.
221231855520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 221231855520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (431995676112).
221231855520 is an abundant number, since it is smaller than the sum of its proper divisors (642759496704).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
221231855520 is a wasteful number, since it uses less digits than its factorization.
221231855520 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2585 (or 2574 counting only the distinct ones).
The product of its (nonzero) digits is 48000, while the sum is 36.
Adding to 221231855520 its reverse (25558132122), we get a palindrome (246789987642).
The spelling of 221231855520 in words is "two hundred twenty-one billion, two hundred thirty-one million, eight hundred fifty-five thousand, five hundred twenty".
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