21971708952 has 32 divisors (see below), whose sum is σ = 54935470080. Its totient is φ = 7323076640.

The previous prime is 21971708947. The next prime is 21971708963. The reversal of 21971708952 is 25980717912.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21971708895 and 21971708904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188233 + ... + 281735.

It is an arithmetic number, because the mean of its divisors is an integer number (1716733440).

Almost surely, 2^21971708952 is an apocalyptic number.

It is an amenable number.

21971708952 is an abundant number, since it is smaller than the sum of its proper divisors (32963761128).

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

21971708952 is a wasteful number, since it uses less digits than its factorization.

21971708952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103303 (or 103299 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 51.

The spelling of 21971708952 in words is "twenty-one billion, nine hundred seventy-one million, seven hundred eight thousand, nine hundred fifty-two".