21796272 has 60 divisors (see below), whose sum is σ = 63661104. Its totient is φ = 6948480.

The previous prime is 21796253. The next prime is 21796279. The reversal of 21796272 is 27269712.

21796272 is a `hidden beast` number, since 21 + 7 + 9 + 627 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21796279) by changing a digit.

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, 22 + ... + 6602.

Almost surely, 2^21796272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21796272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31830552).

21796272 is an abundant number, since it is smaller than the sum of its proper divisors (41864832).

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

21796272 is a wasteful number, since it uses less digits than its factorization.

21796272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6618 (or 6609 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 21796272 is about 4668.6477699651. The cubic root of 21796272 is about 279.3363192848.

The spelling of 21796272 in words is "twenty-one million, seven hundred ninety-six thousand, two hundred seventy-two".