| Base | Representation |
|---|---|
| bin | 100100011001010… |
| … | …1000100111001100 |
| 3 | 10011002222001212120 |
| 4 | 1020302220213030 |
| 5 | 10000113424400 |
| 6 | 321103132540 |
| 7 | 42156211233 |
| oct | 11062504714 |
| 9 | 3132861776 |
| 10 | 1221233100 |
| 11 | 57739955a |
| 12 | 2a0ba4150 |
| 13 | 166019c49 |
| 14 | b8299b1a |
| 15 | 72331ca0 |
| hex | 48ca89cc |
1221233100 has 144 divisors (see below), whose sum is σ = 3651328800. Its totient is φ = 314910720.
The previous prime is 1221233089. The next prime is 1221233119. The reversal of 1221233100 is 13321221.
It is a super-2 number, since 2×12212331002 = 2982820569071220000, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a self number, because there is not a number n which added to its sum of digits gives 1221233100.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2985696 + ... + 2986104.
It is an arithmetic number, because the mean of its divisors is an integer number (25356450).
Almost surely, 21221233100 is an apocalyptic number.
1221233100 is a gapful number since it is divisible by the number (10) 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 1221233100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1825664400).
1221233100 is an abundant number, since it is smaller than the sum of its proper divisors (2430095700).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1221233100 is a wasteful number, since it uses less digits than its factorization.
1221233100 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 732 (or 725 counting only the distinct ones).
The product of its (nonzero) digits is 72, while the sum is 15.
The square root of 1221233100 is about 34946.1457102210. The cubic root of 1221233100 is about 1068.8896100237.
Adding to 1221233100 its reverse (13321221), we get a palindrome (1234554321).
The spelling of 1221233100 in words is "one billion, two hundred twenty-one million, two hundred thirty-three thousand, one hundred".
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