21157736316 has 72 divisors (see below), whose sum is σ = 50445601920. Its totient is φ = 6901861824.

The previous prime is 21157736293. The next prime is 21157736329. The reversal of 21157736316 is 61363775112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23022105 + ... + 23023023.

It is an arithmetic number, because the mean of its divisors is an integer number (700633360).

Almost surely, 2^21157736316 is an apocalyptic number.

It is an amenable number.

21157736316 is an abundant number, since it is smaller than the sum of its proper divisors (29287865604).

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

21157736316 is a wasteful number, since it uses less digits than its factorization.

21157736316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715 (or 1660 counting only the distinct ones).

The product of its digits is 158760, while the sum is 42.

The spelling of 21157736316 in words is "twenty-one billion, one hundred fifty-seven million, seven hundred thirty-six thousand, three hundred sixteen".