31213321233113 has 4 divisors (see below), whose sum is σ = 31220102319888. Its totient is φ = 31206540146340.

The previous prime is 31213321233097. The next prime is 31213321233119. The reversal of 31213321233113 is 31133212331213.

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 31213321233113 - 2⁴ = 31213321233097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213321233119) 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, 3390536483 + ... + 3390545688.

It is an arithmetic number, because the mean of its divisors is an integer number (7805025579972).

Almost surely, 2^{31213321233113} is an apocalyptic number.

It is an amenable number.

31213321233113 is a deficient number, since it is larger than the sum of its proper divisors (6781086775).

31213321233113 is an equidigital number, since it uses as much as digits as its factorization.

31213321233113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6781086774.

The product of its digits is 5832, while the sum is 29.

Adding to 31213321233113 its reverse (31133212331213), we get a palindrome (62346533564326).

The spelling of 31213321233113 in words is "thirty-one trillion, two hundred thirteen billion, three hundred twenty-one million, two hundred thirty-three thousand, one hundred thirteen".