31031522121 has 4 divisors (see below), whose sum is σ = 41375362832. Its totient is φ = 20687681412.

The previous prime is 31031522111. The next prime is 31031522131. The reversal of 31031522121 is 12122513013.

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 an interprime number because it is at equal distance from previous prime (31031522111) and next prime (31031522131).

It is not a de Polignac number, because 31031522121 - 2¹⁰ = 31031521097 is a prime.

It is a super-2 number, since 2×31031522121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31031522111) 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, 5171920351 + ... + 5171920356.

It is an arithmetic number, because the mean of its divisors is an integer number (10343840708).

Almost surely, 2^31031522121 is an apocalyptic number.

It is an amenable number.

31031522121 is a deficient number, since it is larger than the sum of its proper divisors (10343840711).

31031522121 is a wasteful number, since it uses less digits than its factorization.

31031522121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10343840710.

The product of its (nonzero) digits is 360, while the sum is 21.

The spelling of 31031522121 in words is "thirty-one billion, thirty-one million, five hundred twenty-two thousand, one hundred twenty-one".