21553116524 has 12 divisors (see below), whose sum is σ = 38595115944. Its totient is φ = 10525940544.

The previous prime is 21553116499. The next prime is 21553116539. The reversal of 21553116524 is 42561135512.

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, 62654237 + ... + 62654580.

It is an arithmetic number, because the mean of its divisors is an integer number (3216259662).

Almost surely, 2^21553116524 is an apocalyptic number.

It is an amenable number.

21553116524 is a deficient number, since it is larger than the sum of its proper divisors (17041999420).

21553116524 is a wasteful number, since it uses less digits than its factorization.

21553116524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125308864 (or 125308862 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The spelling of 21553116524 in words is "twenty-one billion, five hundred fifty-three million, one hundred sixteen thousand, five hundred twenty-four".