21793272 has 16 divisors (see below), whose sum is σ = 54483240. Its totient is φ = 7264416.

The previous prime is 21793253. The next prime is 21793283. The reversal of 21793272 is 27239712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454003 + ... + 454050.

Almost surely, 2^21793272 is an apocalyptic number.

It is an amenable number.

21793272 is an abundant number, since it is smaller than the sum of its proper divisors (32689968).

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

21793272 is a wasteful number, since it uses less digits than its factorization.

21793272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908062 (or 908058 counting only the distinct ones).

The product of its digits is 10584, while the sum is 33.

The square root of 21793272 is about 4668.3264667330. The cubic root of 21793272 is about 279.3235029125.

The spelling of 21793272 in words is "twenty-one million, seven hundred ninety-three thousand, two hundred seventy-two".