21004535124 has 18 divisors (see below), whose sum is σ = 53094797210. Its totient is φ = 7001511696.

The previous prime is 21004535117. The next prime is 21004535159. The reversal of 21004535124 is 42153540012.

21004535124 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 4 + 535 + 124 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12663000900 + 8341534224 = 112530^2 + 91332^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 291729619 + ... + 291729690.

Almost surely, 2^21004535124 is an apocalyptic number.

It is an amenable number.

21004535124 is an abundant number, since it is smaller than the sum of its proper divisors (32090262086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21004535124 is a wasteful number, since it uses less digits than its factorization.

21004535124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583459319 (or 583459314 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21004535124 in words is "twenty-one billion, four million, five hundred thirty-five thousand, one hundred twenty-four".