42369693921 has 15 divisors (see below), whose sum is σ = 63295767073. Its totient is φ = 28245227580.

The previous prime is 42369693913. The next prime is 42369693937. The reversal of 42369693921 is 12939696324.

The square root of 42369693921 is 205839.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 42369693921 - 2³ = 42369693913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42369693901) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1841116 + ... + 1863986.

Almost surely, 2^42369693921 is an apocalyptic number.

42369693921 is the 205839-th square number.

42369693921 is the 102920-th centered octagonal number.

It is an amenable number.

42369693921 is a deficient number, since it is larger than the sum of its proper divisors (20926073152).

42369693921 is an frugal number, since it uses more digits than its factorization.

42369693921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45754 (or 22874 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The spelling of 42369693921 in words is "forty-two billion, three hundred sixty-nine million, six hundred ninety-three thousand, nine hundred twenty-one".