421997017911 has 24 divisors (see below), whose sum is σ = 665619661440. Its totient is φ = 237054010032.

The previous prime is 421997017879. The next prime is 421997017921. The reversal of 421997017911 is 119710799124.

It is a happy number.

It is not a de Polignac number, because 421997017911 - 2⁵ = 421997017879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421997017921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24319531 + ... + 24336876.

It is an arithmetic number, because the mean of its divisors is an integer number (27734152560).

Almost surely, 2^421997017911 is an apocalyptic number.

421997017911 is a deficient number, since it is larger than the sum of its proper divisors (243622643529).

421997017911 is a wasteful number, since it uses less digits than its factorization.

421997017911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48656483 (or 48656476 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 51.

The spelling of 421997017911 in words is "four hundred twenty-one billion, nine hundred ninety-seven million, seventeen thousand, nine hundred eleven".