6921997572 has 48 divisors (see below), whose sum is σ = 18466058240. Its totient is φ = 1976920992.

The previous prime is 6921997561. The next prime is 6921997573. The reversal of 6921997572 is 2757991296.

It is not an unprimeable number, because it can be changed into a prime (6921997573) 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, 213243 + ... + 243549.

Almost surely, 2^6921997572 is an apocalyptic number.

It is an amenable number.

6921997572 is an abundant number, since it is smaller than the sum of its proper divisors (11544060668).

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

6921997572 is a wasteful number, since it uses less digits than its factorization.

6921997572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33040 (or 33038 counting only the distinct ones).

The product of its digits is 4286520, while the sum is 57.

The square root of 6921997572 is about 83198.5430882056. The cubic root of 6921997572 is about 1905.7992317414.

The spelling of 6921997572 in words is "six billion, nine hundred twenty-one million, nine hundred ninety-seven thousand, five hundred seventy-two".