421770187931 has 4 divisors (see below), whose sum is σ = 421774149864. Its totient is φ = 421766226000.

The previous prime is 421770187921. The next prime is 421770187967. The reversal of 421770187931 is 139781077124.

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 421770187931 - 2²⁶ = 421703079067 is a prime.

It is a super-2 number, since 2×421770187931² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421770187931.

It is not an unprimeable number, because it can be changed into a prime (421770187921) 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, 1816745 + ... + 2035706.

It is an arithmetic number, because the mean of its divisors is an integer number (105443537466).

Almost surely, 2^421770187931 is an apocalyptic number.

421770187931 is a deficient number, since it is larger than the sum of its proper divisors (3961933).

421770187931 is a wasteful number, since it uses less digits than its factorization.

421770187931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961932.

The product of its (nonzero) digits is 592704, while the sum is 50.

The spelling of 421770187931 in words is "four hundred twenty-one billion, seven hundred seventy million, one hundred eighty-seven thousand, nine hundred thirty-one".