21134504884 has 12 divisors (see below), whose sum is σ = 37031794884. Its totient is φ = 10553992064.

The previous prime is 21134504861. The next prime is 21134504903. The reversal of 21134504884 is 48840543112.

It can be written as a sum of positive squares in 2 ways, for example, as 13462496784 + 7672008100 = 116028^2 + 87590^2 .

It is a congruent number.

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, 3311509 + ... + 3317884.

It is an arithmetic number, because the mean of its divisors is an integer number (3085982907).

Almost surely, 2^21134504884 is an apocalyptic number.

It is an amenable number.

21134504884 is a deficient number, since it is larger than the sum of its proper divisors (15897290000).

21134504884 is a wasteful number, since it uses less digits than its factorization.

21134504884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6630194 (or 6630192 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The spelling of 21134504884 in words is "twenty-one billion, one hundred thirty-four million, five hundred four thousand, eight hundred eighty-four".