21136527 has 18 divisors (see below), whose sum is σ = 31032456. Its totient is φ = 13861800.

The previous prime is 21136523. The next prime is 21136541. The reversal of 21136527 is 72563112.

It is a happy number.

21136527 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 652 + 7 = 666.

It is not a de Polignac number, because 21136527 - 2² = 21136523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21136527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136523) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 139902 + ... + 140052.

Almost surely, 2^21136527 is an apocalyptic number.

21136527 is a deficient number, since it is larger than the sum of its proper divisors (9895929).

21136527 is a wasteful number, since it uses less digits than its factorization.

21136527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 257 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 21136527 is about 4597.4478789868. The cubic root of 21136527 is about 276.4890117681.

Adding to 21136527 its reverse (72563112), we get a palindrome (93699639).

The spelling of 21136527 in words is "twenty-one million, one hundred thirty-six thousand, five hundred twenty-seven".