21233100 has 72 divisors (see below), whose sum is σ = 70217728. Its totient is φ = 4852800.

The previous prime is 21233087. The next prime is 21233111. The reversal of 21233100 is 133212.

It is a happy number.

It is a super-2 number, since 2×21233100² = 901689071220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2956 + ... + 7155.

Almost surely, 2^21233100 is an apocalyptic number.

21233100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233100 is an abundant number, since it is smaller than the sum of its proper divisors (48984628).

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

21233100 is a wasteful number, since it uses less digits than its factorization.

21233100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10135 (or 10128 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21233100 is about 4607.9388016769. The cubic root of 21233100 is about 276.9094657365.

Adding to 21233100 its reverse (133212), we get a palindrome (21366312).

The spelling of 21233100 in words is "twenty-one million, two hundred thirty-three thousand, one hundred".