31312022223121 has 4 divisors (see below), whose sum is σ = 31312112412672. Its totient is φ = 31311932033572.

The previous prime is 31312022223109. The next prime is 31312022223127. The reversal of 31312022223121 is 12132222021313.

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 31312022223121 - 2⁵ = 31312022223089 is a prime.

It is a super-2 number, since 2×31312022223121² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31312022223127) 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, 44571985 + ... + 45269038.

It is an arithmetic number, because the mean of its divisors is an integer number (7828028103168).

Almost surely, 2^{31312022223121} is an apocalyptic number.

It is an amenable number.

31312022223121 is a deficient number, since it is larger than the sum of its proper divisors (90189551).

31312022223121 is an equidigital number, since it uses as much as digits as its factorization.

31312022223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90189550.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 31312022223121 its reverse (12132222021313), we get a palindrome (43444244244434).

The spelling of 31312022223121 in words is "thirty-one trillion, three hundred twelve billion, twenty-two million, two hundred twenty-three thousand, one hundred twenty-one".