23021900 has 36 divisors (see below), whose sum is σ = 54501720. Its totient is φ = 8371200.

The previous prime is 23021861. The next prime is 23021903. The reversal of 23021900 is 912032.

It is a super-2 number, since 2×23021900² = 1060015759220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23021903) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 9365 + ... + 11564.

Almost surely, 2^23021900 is an apocalyptic number.

23021900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23021900 is an abundant number, since it is smaller than the sum of its proper divisors (31479820).

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

23021900 is a wasteful number, since it uses less digits than its factorization.

23021900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20954 (or 20947 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 23021900 is about 4798.1142128966. The cubic root of 23021900 is about 284.4769312170.

Adding to 23021900 its reverse (912032), we get a palindrome (23933932).

The spelling of 23021900 in words is "twenty-three million, twenty-one thousand, nine hundred".