21534160724 has 12 divisors (see below), whose sum is σ = 37841151348. Its totient is φ = 10722403200.

The previous prime is 21534160717. The next prime is 21534160759. The reversal of 21534160724 is 42706143512.

It can be written as a sum of positive squares in 2 ways, for example, as 15943607824 + 5590552900 = 126268^2 + 74770^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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, 11168207 + ... + 11170134.

It is an arithmetic number, because the mean of its divisors is an integer number (3153429279).

Almost surely, 2^21534160724 is an apocalyptic number.

It is an amenable number.

21534160724 is a deficient number, since it is larger than the sum of its proper divisors (16306990624).

21534160724 is a wasteful number, since it uses less digits than its factorization.

21534160724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22338586 (or 22338584 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 21534160724 in words is "twenty-one billion, five hundred thirty-four million, one hundred sixty thousand, seven hundred twenty-four".