31021012013 has 4 divisors (see below), whose sum is σ = 31108890588. Its totient is φ = 30933133440.

The previous prime is 31021011977. The next prime is 31021012037.

31021012013 is nontrivially palindromic in base 10.

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 11184543049 + 19836468964 = 105757^2 + 140842^2 .

It is a cyclic number.

It is not a de Polignac number, because 31021012013 - 2⁶ = 31021011949 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 (31021012063) 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, 43938758 + ... + 43939463.

It is an arithmetic number, because the mean of its divisors is an integer number (7777222647).

Almost surely, 2^31021012013 is an apocalyptic number.

It is an amenable number.

31021012013 is a deficient number, since it is larger than the sum of its proper divisors (87878575).

31021012013 is an equidigital number, since it uses as much as digits as its factorization.

31021012013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87878574.

The product of its (nonzero) digits is 36, while the sum is 14.

It can be divided in two parts, 310210 and 12013, that added together give a palindrome (322223).

The spelling of 31021012013 in words is "thirty-one billion, twenty-one million, twelve thousand, thirteen".