31312031002221 has 16 divisors (see below), whose sum is σ = 41845076873600. Its totient is φ = 20826837600768.

The previous prime is 31312031002207. The next prime is 31312031002297. The reversal of 31312031002221 is 12220013021313.

It is not a de Polignac number, because 31312031002221 - 2⁶ = 31312031002157 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 (31312031002621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128112885 + ... + 128357061.

It is an arithmetic number, because the mean of its divisors is an integer number (2615317304600).

Almost surely, 2^{31312031002221} is an apocalyptic number.

It is an amenable number.

31312031002221 is a deficient number, since it is larger than the sum of its proper divisors (10533045871379).

31312031002221 is a wasteful number, since it uses less digits than its factorization.

31312031002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341988.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31312031002221 its reverse (12220013021313), we get a palindrome (43532044023534).

The spelling of 31312031002221 in words is "thirty-one trillion, three hundred twelve billion, thirty-one million, two thousand, two hundred twenty-one".