21975136 has 12 divisors (see below), whose sum is σ = 43263612. Its totient is φ = 10987552.

The previous prime is 21975131. The next prime is 21975137. The reversal of 21975136 is 63157912.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a pancake number, because a pancake can be divided into 21975136 parts by 6629 straight cuts.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21975131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343330 + ... + 343393.

It is an arithmetic number, because the mean of its divisors is an integer number (3605301).

Almost surely, 2^21975136 is an apocalyptic number.

It is an amenable number.

21975136 is a deficient number, since it is larger than the sum of its proper divisors (21288476).

21975136 is an equidigital number, since it uses as much as digits as its factorization.

21975136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686733 (or 686725 counting only the distinct ones).

The product of its digits is 11340, while the sum is 34.

The square root of 21975136 is about 4687.7644992043. The cubic root of 21975136 is about 280.0983328095.

The spelling of 21975136 in words is "twenty-one million, nine hundred seventy-five thousand, one hundred thirty-six".