31021323201313 has 4 divisors (see below), whose sum is σ = 31021687852848. Its totient is φ = 31020958549780.

The previous prime is 31021323201289. The next prime is 31021323201361. The reversal of 31021323201313 is 31310232312013.

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 31021323201313 - 2²¹ = 31021321104161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31021323201613) 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, 182198131 + ... + 182368312.

It is an arithmetic number, because the mean of its divisors is an integer number (7755421963212).

Almost surely, 2^{31021323201313} is an apocalyptic number.

It is an amenable number.

31021323201313 is a deficient number, since it is larger than the sum of its proper divisors (364651535).

31021323201313 is an equidigital number, since it uses as much as digits as its factorization.

31021323201313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364651534.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31021323201313 its reverse (31310232312013), we get a palindrome (62331555513326).

The spelling of 31021323201313 in words is "thirty-one trillion, twenty-one billion, three hundred twenty-three million, two hundred one thousand, three hundred thirteen".