| Base | Representation |
|---|---|
| bin | 10011110001011101… |
| … | …111101101100100000 |
| 3 | 2000210121221020020000 |
| 4 | 103301131331230200 |
| 5 | 321440121024440 |
| 6 | 13430422420000 |
| 7 | 1351060542513 |
| oct | 236135755440 |
| 9 | 60717836200 |
| 10 | 21231033120 |
| 11 | 9005401470 |
| 12 | 4146291600 |
| 13 | 20047463bb |
| 14 | 10559b2d7a |
| 15 | 843d86730 |
| hex | 4f177db20 |
21231033120 has 240 divisors, whose sum is σ = 81740026368. Its totient is φ = 5146882560.
The previous prime is 21231033113. The next prime is 21231033127. The reversal of 21231033120 is 2133013212.
21231033120 is a `hidden beast` number, since 2 + 1 + 2 + 310 + 331 + 20 = 666.
It is an interprime number because it is at equal distance from previous prime (21231033113) and next prime (21231033127).
It is a tau number, because it is divible by the number of its divisors (240).
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 21231033093 and 21231033102.
It is not an unprimeable number, because it can be changed into a prime (21231033127) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 68097 + ... + 217023.
Almost surely, 221231033120 is an apocalyptic number.
21231033120 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 21231033120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40870013184).
21231033120 is an abundant number, since it is smaller than the sum of its proper divisors (60508993248).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21231033120 is a wasteful number, since it uses less digits than its factorization.
21231033120 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 148965 (or 148948 counting only the distinct ones).
The product of its (nonzero) digits is 216, while the sum is 18.
Adding to 21231033120 its reverse (2133013212), we get a palindrome (23364046332).
The spelling of 21231033120 in words is "twenty-one billion, two hundred thirty-one million, thirty-three thousand, one hundred twenty".
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