21796924 has 24 divisors (see below), whose sum is σ = 40951008. Its totient is φ = 10114560.

The previous prime is 21796921. The next prime is 21796927. The reversal of 21796924 is 42969712.

It is an interprime number because it is at equal distance from previous prime (21796921) and next prime (21796927).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796921) 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 7 ways as a sum of consecutive naturals, for example, 2769 + ... + 7159.

It is an arithmetic number, because the mean of its divisors is an integer number (1706292).

Almost surely, 2^21796924 is an apocalyptic number.

It is an amenable number.

21796924 is a deficient number, since it is larger than the sum of its proper divisors (19154084).

21796924 is a wasteful number, since it uses less digits than its factorization.

21796924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4485 (or 4483 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 21796924 is about 4668.7175969424. The cubic root of 21796924 is about 279.3391045541.

The spelling of 21796924 in words is "twenty-one million, seven hundred ninety-six thousand, nine hundred twenty-four".