2165610431421 has 12 divisors (see below), whose sum is σ = 3147294780448. Its totient is φ = 1434882984264.

The previous prime is 2165610431329. The next prime is 2165610431441. The reversal of 2165610431421 is 1241340165612.

2165610431421 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 610 + 4 + 3 + 14 + 21 = 666.

It is not a de Polignac number, because 2165610431421 - 2⁷ = 2165610431293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165610431441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 738107065 + ... + 738109998.

Almost surely, 2^{2165610431421} is an apocalyptic number.

It is an amenable number.

2165610431421 is a deficient number, since it is larger than the sum of its proper divisors (981684349027).

2165610431421 is a wasteful number, since it uses less digits than its factorization.

2165610431421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476217232 (or 1476217229 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 2165610431421 in words is "two trillion, one hundred sixty-five billion, six hundred ten million, four hundred thirty-one thousand, four hundred twenty-one".