21373660660516 has 48 divisors (see below), whose sum is σ = 38230219399680. Its totient is φ = 10452667719680.

The previous prime is 21373660660507. The next prime is 21373660660549. The reversal of 21373660660516 is 61506606637312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52138506 + ... + 52546846.

It is an arithmetic number, because the mean of its divisors is an integer number (796462904160).

Almost surely, 2^{21373660660516} is an apocalyptic number.

It is an amenable number.

21373660660516 is a deficient number, since it is larger than the sum of its proper divisors (16856558739164).

21373660660516 is a wasteful number, since it uses less digits than its factorization.

21373660660516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409524 (or 409522 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 52.

The spelling of 21373660660516 in words is "twenty-one trillion, three hundred seventy-three billion, six hundred sixty million, six hundred sixty thousand, five hundred sixteen".