31221232012013 has 4 divisors (see below), whose sum is σ = 31222184521440. Its totient is φ = 31220279502588.

The previous prime is 31221232011953. The next prime is 31221232012039. The reversal of 31221232012013 is 31021023212213.

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 a de Polignac number, because none of the positive numbers 2^k-31221232012013 is a prime.

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 31221232012013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221232012513) 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, 476205545 + ... + 476271102.

It is an arithmetic number, because the mean of its divisors is an integer number (7805546130360).

Almost surely, 2^{31221232012013} is an apocalyptic number.

It is an amenable number.

31221232012013 is a deficient number, since it is larger than the sum of its proper divisors (952509427).

31221232012013 is an equidigital number, since it uses as much as digits as its factorization.

31221232012013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952509426.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31221232012013 its reverse (31021023212213), we get a palindrome (62242255224226).

The spelling of 31221232012013 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred thirty-two million, twelve thousand, thirteen".