21306624524 has 12 divisors (see below), whose sum is σ = 37635066504. Its totient is φ = 10553748384.

The previous prime is 21306624497. The next prime is 21306624541. The reversal of 21306624524 is 42542660312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24890489 + ... + 24891344.

It is an arithmetic number, because the mean of its divisors is an integer number (3136255542).

Almost surely, 2^21306624524 is an apocalyptic number.

It is an amenable number.

21306624524 is a deficient number, since it is larger than the sum of its proper divisors (16328441980).

21306624524 is a wasteful number, since it uses less digits than its factorization.

21306624524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49781944 (or 49781942 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 21306624524 in words is "twenty-one billion, three hundred six million, six hundred twenty-four thousand, five hundred twenty-four".