12021871952 has 20 divisors (see below), whose sum is σ = 23297506260. Its totient is φ = 6009612288.

The previous prime is 12021871937. The next prime is 12021871991. The reversal of 12021871952 is 25917812021.

It can be written as a sum of positive squares in 2 ways, for example, as 9608704576 + 2413167376 = 98024^2 + 49124^2 .

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, 5627 + ... + 155162.

It is an arithmetic number, because the mean of its divisors is an integer number (1164875313).

Almost surely, 2^12021871952 is an apocalyptic number.

It is an amenable number.

12021871952 is a deficient number, since it is larger than the sum of its proper divisors (11275634308).

12021871952 is a wasteful number, since it uses less digits than its factorization.

12021871952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165470 (or 165464 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 38.

The spelling of 12021871952 in words is "twelve billion, twenty-one million, eight hundred seventy-one thousand, nine hundred fifty-two".