21201077568 has 112 divisors (see below), whose sum is σ = 63168215040. Its totient is φ = 6217305600.

The previous prime is 21201077561. The next prime is 21201077581. The reversal of 21201077568 is 86577010212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201077561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96438 + ... + 227381.

It is an arithmetic number, because the mean of its divisors is an integer number (564001920).

Almost surely, 2^21201077568 is an apocalyptic number.

It is an amenable number.

21201077568 is an abundant number, since it is smaller than the sum of its proper divisors (41967137472).

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

21201077568 is a wasteful number, since it uses less digits than its factorization.

21201077568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323876 (or 323866 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 39.

The spelling of 21201077568 in words is "twenty-one billion, two hundred one million, seventy-seven thousand, five hundred sixty-eight".