21973392 has 60 divisors (see below), whose sum is σ = 70283200. Its totient is φ = 6277824.

The previous prime is 21973379. The next prime is 21973423. The reversal of 21973392 is 29337912.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

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 11 ways as a sum of consecutive naturals, for example, 9892 + ... + 11907.

Almost surely, 2^21973392 is an apocalyptic number.

It is an amenable number.

21973392 is an abundant number, since it is smaller than the sum of its proper divisors (48309808).

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

21973392 is a wasteful number, since it uses less digits than its factorization.

21973392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21820 (or 21811 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 21973392 is about 4687.5784793430. The cubic root of 21973392 is about 280.0909228529.

The spelling of 21973392 in words is "twenty-one million, nine hundred seventy-three thousand, three hundred ninety-two".