31122013213 has 16 divisors (see below), whose sum is σ = 32297126400. Its totient is φ = 29968859520.

The previous prime is 31122013211. The next prime is 31122013231. The reversal of 31122013213 is 31231022113.

It is a cyclic number.

It is not a de Polignac number, because 31122013213 - 2¹ = 31122013211 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 (31122013211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1162108 + ... + 1188586.

It is an arithmetic number, because the mean of its divisors is an integer number (2018570400).

Almost surely, 2^31122013213 is an apocalyptic number.

It is an amenable number.

31122013213 is a deficient number, since it is larger than the sum of its proper divisors (1175113187).

31122013213 is a wasteful number, since it uses less digits than its factorization.

31122013213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26892.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31122013213 its reverse (31231022113), we get a palindrome (62353035326).

The spelling of 31122013213 in words is "thirty-one billion, one hundred twenty-two million, thirteen thousand, two hundred thirteen".