421137921679 has 4 divisors (see below), whose sum is σ = 421304316120. Its totient is φ = 420971527240.

The previous prime is 421137921647. The next prime is 421137921713. The reversal of 421137921679 is 976129731124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421137921679 - 2⁵ = 421137921647 is a prime.

It is a super-2 number, since 2×421137921679² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421137921619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83193424 + ... + 83198485.

It is an arithmetic number, because the mean of its divisors is an integer number (105326079030).

Almost surely, 2^421137921679 is an apocalyptic number.

421137921679 is a deficient number, since it is larger than the sum of its proper divisors (166394441).

421137921679 is a wasteful number, since it uses less digits than its factorization.

421137921679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166394440.

The product of its digits is 1143072, while the sum is 52.

The spelling of 421137921679 in words is "four hundred twenty-one billion, one hundred thirty-seven million, nine hundred twenty-one thousand, six hundred seventy-nine".