421983646877 has 4 divisors (see below), whose sum is σ = 454443927420. Its totient is φ = 389523366336.

The previous prime is 421983646811. The next prime is 421983646879. The reversal of 421983646877 is 778646389124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24553009636 + 397430637241 = 156694^2 + 630421^2 .

It is not a de Polignac number, because 421983646877 - 2⁸ = 421983646621 is a prime.

It is a super-2 number, since 2×421983646877² (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 (421983646879) 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, 16230140252 + ... + 16230140277.

It is an arithmetic number, because the mean of its divisors is an integer number (113610981855).

Almost surely, 2^421983646877 is an apocalyptic number.

It is an amenable number.

421983646877 is a deficient number, since it is larger than the sum of its proper divisors (32460280543).

421983646877 is a wasteful number, since it uses less digits than its factorization.

421983646877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32460280542.

The product of its digits is 97542144, while the sum is 65.

The spelling of 421983646877 in words is "four hundred twenty-one billion, nine hundred eighty-three million, six hundred forty-six thousand, eight hundred seventy-seven".