31113311210213 has 4 divisors (see below), whose sum is σ = 31115908109868. Its totient is φ = 31110714310560.

The previous prime is 31113311210203. The next prime is 31113311210239. The reversal of 31113311210213 is 31201211331113.

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 13305729880804 + 17807581329409 = 3647702^2 + 4219903^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113311210213 - 2⁸ = 31113311209957 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 (31113311210203) 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, 1298431856 + ... + 1298455817.

It is an arithmetic number, because the mean of its divisors is an integer number (7778977027467).

Almost surely, 2^{31113311210213} is an apocalyptic number.

It is an amenable number.

31113311210213 is a deficient number, since it is larger than the sum of its proper divisors (2596899655).

31113311210213 is a wasteful number, since it uses less digits than its factorization.

31113311210213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596899654.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 31113311210213 its reverse (31201211331113), we get a palindrome (62314522541326).

The spelling of 31113311210213 in words is "thirty-one trillion, one hundred thirteen billion, three hundred eleven million, two hundred ten thousand, two hundred thirteen".