21970043572 has 12 divisors (see below), whose sum is σ = 39173002596. Its totient is φ = 10777757120.

The previous prime is 21970043489. The next prime is 21970043581. The reversal of 21970043572 is 27534007912.

It can be written as a sum of positive squares in 2 ways, for example, as 6587594896 + 15382448676 = 81164^2 + 124026^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51815929 + ... + 51816352.

It is an arithmetic number, because the mean of its divisors is an integer number (3264416883).

Almost surely, 2^21970043572 is an apocalyptic number.

It is an amenable number.

21970043572 is a deficient number, since it is larger than the sum of its proper divisors (17202959024).

21970043572 is a wasteful number, since it uses less digits than its factorization.

21970043572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103632338 (or 103632336 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 21970043572 in words is "twenty-one billion, nine hundred seventy million, forty-three thousand, five hundred seventy-two".