21502552604 has 24 divisors (see below), whose sum is σ = 40529910960. Its totient is φ = 9922817664.

The previous prime is 21502552583. The next prime is 21502552619. The reversal of 21502552604 is 40625520512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388112 + ... + 440040.

It is an arithmetic number, because the mean of its divisors is an integer number (1688746290).

Almost surely, 2^21502552604 is an apocalyptic number.

It is an amenable number.

21502552604 is a deficient number, since it is larger than the sum of its proper divisors (19027358356).

21502552604 is a wasteful number, since it uses less digits than its factorization.

21502552604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59909 (or 59907 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 21502552604 in words is "twenty-one billion, five hundred two million, five hundred fifty-two thousand, six hundred four".