21074957896 has 8 divisors (see below), whose sum is σ = 39515546070. Its totient is φ = 10537478944.

The previous prime is 21074957821. The next prime is 21074957899. The reversal of 21074957896 is 69875947012.

It can be written as a sum of positive squares in only one way, i.e., 15397335396 + 5677622500 = 124086^2 + 75350^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21074957896.

It is not an unprimeable number, because it can be changed into a prime (21074957899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1317184861 + ... + 1317184876.

Almost surely, 2^21074957896 is an apocalyptic number.

It is an amenable number.

21074957896 is a deficient number, since it is larger than the sum of its proper divisors (18440588174).

21074957896 is a wasteful number, since it uses less digits than its factorization.

21074957896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634369743 (or 2634369739 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 21074957896 in words is "twenty-one billion, seventy-four million, nine hundred fifty-seven thousand, eight hundred ninety-six".