31120321120013 has 4 divisors (see below), whose sum is σ = 31144204713888. Its totient is φ = 31096437526140.

The previous prime is 31120321119989. The next prime is 31120321120033. The reversal of 31120321120013 is 31002112302113.

It is a happy number.

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 31120321120013 - 2¹⁴ = 31120321103629 is a prime.

It is a super-2 number, since 2×31120321120013² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120321120033) 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, 11941794983 + ... + 11941797588.

It is an arithmetic number, because the mean of its divisors is an integer number (7786051178472).

Almost surely, 2^{31120321120013} is an apocalyptic number.

It is an amenable number.

31120321120013 is a deficient number, since it is larger than the sum of its proper divisors (23883593875).

31120321120013 is a wasteful number, since it uses less digits than its factorization.

31120321120013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23883593874.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31120321120013 its reverse (31002112302113), we get a palindrome (62122433422126).

The spelling of 31120321120013 in words is "thirty-one trillion, one hundred twenty billion, three hundred twenty-one million, one hundred twenty thousand, thirteen".