21870663174 has 32 divisors (see below), whose sum is σ = 49047372000. Its totient is φ = 7223336352.

The previous prime is 21870663151. The next prime is 21870663181. The reversal of 21870663174 is 47136607812.

21870663174 is a `hidden beast` number, since 2 + 1 + 8 + 7 + 0 + 6 + 631 + 7 + 4 = 666.

It is a congruent number.

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, 1851969 + ... + 1863740.

It is an arithmetic number, because the mean of its divisors is an integer number (1532730375).

Almost surely, 2^21870663174 is an apocalyptic number.

21870663174 is an abundant number, since it is smaller than the sum of its proper divisors (27176708826).

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

21870663174 is a wasteful number, since it uses less digits than its factorization.

21870663174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715829 (or 3715823 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 21870663174 in words is "twenty-one billion, eight hundred seventy million, six hundred sixty-three thousand, one hundred seventy-four".