21533136904 has 24 divisors (see below), whose sum is σ = 42753007710. Its totient is φ = 10132435584.

The previous prime is 21533136871. The next prime is 21533136923. The reversal of 21533136904 is 40963133512.

It can be written as a sum of positive squares in only one way, i.e., 15833188900 + 5699948004 = 125830^2 + 75498^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1704997 + ... + 1717579.

Almost surely, 2^21533136904 is an apocalyptic number.

It is an amenable number.

21533136904 is a deficient number, since it is larger than the sum of its proper divisors (21219870806).

21533136904 is an frugal number, since it uses more digits than its factorization.

21533136904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25189 (or 12602 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 37.

The spelling of 21533136904 in words is "twenty-one billion, five hundred thirty-three million, one hundred thirty-six thousand, nine hundred four".