31327421213 has 4 divisors (see below), whose sum is σ = 34175368608. Its totient is φ = 28479473820.

The previous prime is 31327421189. The next prime is 31327421227. The reversal of 31327421213 is 31212472313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31327421213 - 2³⁰ = 30253679389 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 (31327421243) 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, 1423973681 + ... + 1423973702.

It is an arithmetic number, because the mean of its divisors is an integer number (8543842152).

Almost surely, 2^31327421213 is an apocalyptic number.

It is an amenable number.

31327421213 is a deficient number, since it is larger than the sum of its proper divisors (2847947395).

31327421213 is a wasteful number, since it uses less digits than its factorization.

31327421213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847947394.

The product of its digits is 6048, while the sum is 29.

Adding to 31327421213 its reverse (31212472313), we get a palindrome (62539893526).

The spelling of 31327421213 in words is "thirty-one billion, three hundred twenty-seven million, four hundred twenty-one thousand, two hundred thirteen".