21042534708 has 36 divisors (see below), whose sum is σ = 57282456868. Its totient is φ = 6474625920.

The previous prime is 21042534701. The next prime is 21042534727. The reversal of 21042534708 is 80743524012.

It is a happy number.

21042534708 is a `hidden beast` number, since 2 + 10 + 42 + 534 + 70 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2001846564 + 19040688144 = 44742^2 + 137988^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042534701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22480873 + ... + 22481808.

Almost surely, 2^21042534708 is an apocalyptic number.

It is an amenable number.

21042534708 is an abundant number, since it is smaller than the sum of its proper divisors (36239922160).

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

21042534708 is a wasteful number, since it uses less digits than its factorization.

21042534708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44962704 (or 44962699 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 21042534708 in words is "twenty-one billion, forty-two million, five hundred thirty-four thousand, seven hundred eight".