21060615016716 has 24 divisors (see below), whose sum is σ = 53608838224704. Its totient is φ = 6382004550480.

The previous prime is 21060615016699. The next prime is 21060615016747. The reversal of 21060615016716 is 61761051606012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79775056750 + ... + 79775057013.

It is an arithmetic number, because the mean of its divisors is an integer number (2233701592696).

Almost surely, 2^{21060615016716} is an apocalyptic number.

It is an amenable number.

21060615016716 is an abundant number, since it is smaller than the sum of its proper divisors (32548223207988).

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

21060615016716 is a wasteful number, since it uses less digits than its factorization.

21060615016716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159550113781 (or 159550113779 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 21060615016716 in words is "twenty-one trillion, sixty billion, six hundred fifteen million, sixteen thousand, seven hundred sixteen".