31013231203121 has 4 divisors (see below), whose sum is σ = 31015168698432. Its totient is φ = 31011293707812.

The previous prime is 31013231203117. The next prime is 31013231203159. The reversal of 31013231203121 is 12130213231013.

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 31013231203121 - 2² = 31013231203117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31013231203321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968723645 + ... + 968755658.

It is an arithmetic number, because the mean of its divisors is an integer number (7753792174608).

Almost surely, 2^{31013231203121} is an apocalyptic number.

It is an amenable number.

31013231203121 is a deficient number, since it is larger than the sum of its proper divisors (1937495311).

31013231203121 is a wasteful number, since it uses less digits than its factorization.

31013231203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937495310.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31013231203121 its reverse (12130213231013), we get a palindrome (43143444434134).

The spelling of 31013231203121 in words is "thirty-one trillion, thirteen billion, two hundred thirty-one million, two hundred three thousand, one hundred twenty-one".