31102021013 has 4 divisors (see below), whose sum is σ = 35545166880. Its totient is φ = 26658875148.

The previous prime is 31102020857. The next prime is 31102021019. The reversal of 31102021013 is 31012020113.

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 31102021013 - 2⁸ = 31102020757 is a prime.

It is a super-2 number, since 2×31102021013² (a number of 22 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 (31102021019) 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, 2221572923 + ... + 2221572936.

It is an arithmetic number, because the mean of its divisors is an integer number (8886291720).

Almost surely, 2^31102021013 is an apocalyptic number.

It is an amenable number.

31102021013 is a deficient number, since it is larger than the sum of its proper divisors (4443145867).

31102021013 is an equidigital number, since it uses as much as digits as its factorization.

31102021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443145866.

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

Adding to 31102021013 its reverse (31012020113), we get a palindrome (62114041126).

The spelling of 31102021013 in words is "thirty-one billion, one hundred two million, twenty-one thousand, thirteen".