21912352 has 48 divisors (see below), whose sum is σ = 53790912. Its totient is φ = 8536320.

The previous prime is 21912347. The next prime is 21912367. The reversal of 21912352 is 25321912.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1983 + ... + 6910.

It is an arithmetic number, because the mean of its divisors is an integer number (1120644).

Almost surely, 2^21912352 is an apocalyptic number.

21912352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21912352 is an abundant number, since it is smaller than the sum of its proper divisors (31878560).

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

21912352 is a wasteful number, since it uses less digits than its factorization.

21912352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8921 (or 8913 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 21912352 is about 4681.0631271112. The cubic root of 21912352 is about 279.8313269826.

The spelling of 21912352 in words is "twenty-one million, nine hundred twelve thousand, three hundred fifty-two".