21936357 has 12 divisors (see below), whose sum is σ = 32360640. Its totient is φ = 14312808.

The previous prime is 21936349. The next prime is 21936389. The reversal of 21936357 is 75363912.

21936357 is a `hidden beast` number, since 2 + 19 + 3 + 635 + 7 = 666.

It is not a de Polignac number, because 21936357 - 2³ = 21936349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21936337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25507 + ... + 26352.

It is an arithmetic number, because the mean of its divisors is an integer number (2696720).

Almost surely, 2^21936357 is an apocalyptic number.

It is an amenable number.

21936357 is a deficient number, since it is larger than the sum of its proper divisors (10424283).

21936357 is a wasteful number, since it uses less digits than its factorization.

21936357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51912 (or 51909 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 21936357 is about 4683.6264795562. The cubic root of 21936357 is about 279.9334748418.

The spelling of 21936357 in words is "twenty-one million, nine hundred thirty-six thousand, three hundred fifty-seven".