21507076316 has 12 divisors (see below), whose sum is σ = 41058963960. Its totient is φ = 9775943760.

The previous prime is 21507076267. The next prime is 21507076337. The reversal of 21507076316 is 61367070512.

It is a self number, because there is not a number n which added to its sum of digits gives 21507076316.

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, 244398551 + ... + 244398638.

It is an arithmetic number, because the mean of its divisors is an integer number (3421580330).

Almost surely, 2^21507076316 is an apocalyptic number.

It is an amenable number.

21507076316 is a deficient number, since it is larger than the sum of its proper divisors (19551887644).

21507076316 is a wasteful number, since it uses less digits than its factorization.

21507076316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488797204 (or 488797202 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 38.

The spelling of 21507076316 in words is "twenty-one billion, five hundred seven million, seventy-six thousand, three hundred sixteen".