21231233100 has 216 divisors, whose sum is σ = 82969356288. Its totient is φ = 4411670400.

The previous prime is 21231233039. The next prime is 21231233113. The reversal of 21231233100 is 133213212.

21231233100 is a `hidden beast` number, since 21 + 2 + 312 + 331 + 0 + 0 = 666.

It is a super-2 number, since 2×21231233100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 83884 + ... + 222483.

Almost surely, 2^21231233100 is an apocalyptic number.

21231233100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231233100 is an abundant number, since it is smaller than the sum of its proper divisors (61738123188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21231233100 is a wasteful number, since it uses less digits than its factorization.

21231233100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306405 (or 306395 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21231233100 its reverse (133213212), we get a palindrome (21364446312).

The spelling of 21231233100 in words is "twenty-one billion, two hundred thirty-one million, two hundred thirty-three thousand, one hundred".