21064527 has 54 divisors (see below), whose sum is σ = 36143016. Its totient is φ = 11790240.

The previous prime is 21064523. The next prime is 21064553. The reversal of 21064527 is 72546012.

21064527 is a `hidden beast` number, since 2 + 10 + 645 + 2 + 7 = 666.

It is not a de Polignac number, because 21064527 - 2² = 21064523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21064527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21064523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 726349 + ... + 726377.

Almost surely, 2^21064527 is an apocalyptic number.

21064527 is a deficient number, since it is larger than the sum of its proper divisors (15078489).

21064527 is a wasteful number, since it uses less digits than its factorization.

21064527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 21064527 is about 4589.6107678103. The cubic root of 21064527 is about 276.1747082268.

The spelling of 21064527 in words is "twenty-one million, sixty-four thousand, five hundred twenty-seven".