21264597 has 6 divisors (see below), whose sum is σ = 30715542. Its totient is φ = 14176392.

The previous prime is 21264587. The next prime is 21264601. The reversal of 21264597 is 79546212.

21264597 is a `hidden beast` number, since 2 + 1 + 2 + 64 + 597 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 4691556 = 4071^2 + 2166^2 .

It is not a de Polignac number, because 21264597 - 2¹² = 21260501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21264577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1181358 + ... + 1181375.

It is an arithmetic number, because the mean of its divisors is an integer number (5119257).

Almost surely, 2^21264597 is an apocalyptic number.

It is an amenable number.

21264597 is a deficient number, since it is larger than the sum of its proper divisors (9450945).

21264597 is a wasteful number, since it uses less digits than its factorization.

21264597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362739 (or 2362736 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 21264597 is about 4611.3552237927. The cubic root of 21264597 is about 277.0463198051.

The spelling of 21264597 in words is "twenty-one million, two hundred sixty-four thousand, five hundred ninety-seven".