31420839421 has 4 divisors (see below), whose sum is σ = 31421255292. Its totient is φ = 31420423552.

The previous prime is 31420839397. The next prime is 31420839427. The reversal of 31420839421 is 12493802413.

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 5071433796 + 26349405625 = 71214^2 + 162325^2 .

It is a cyclic number.

It is not a de Polignac number, because 31420839421 - 2¹³ = 31420831229 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 (31420839427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59086 + ... + 257551.

It is an arithmetic number, because the mean of its divisors is an integer number (7855313823).

Almost surely, 2^31420839421 is an apocalyptic number.

It is an amenable number.

31420839421 is a deficient number, since it is larger than the sum of its proper divisors (415871).

31420839421 is an equidigital number, since it uses as much as digits as its factorization.

31420839421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415870.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 31420839421 in words is "thirty-one billion, four hundred twenty million, eight hundred thirty-nine thousand, four hundred twenty-one".