21170516670 has 64 divisors (see below), whose sum is σ = 59775589440. Its totient is φ = 5313383424.

The previous prime is 21170516651. The next prime is 21170516701. The reversal of 21170516670 is 7661507112.

21170516670 is a `hidden beast` number, since 2 + 1 + 1 + 70 + 516 + 6 + 70 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2301567 + ... + 2310746.

It is an arithmetic number, because the mean of its divisors is an integer number (933993585).

Almost surely, 2^21170516670 is an apocalyptic number.

21170516670 is an abundant number, since it is smaller than the sum of its proper divisors (38605072770).

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

21170516670 is a wasteful number, since it uses less digits than its factorization.

21170516670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4612346 (or 4612340 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The spelling of 21170516670 in words is "twenty-one billion, one hundred seventy million, five hundred sixteen thousand, six hundred seventy".