31002122121 has 4 divisors (see below), whose sum is σ = 41336162832. Its totient is φ = 20668081412.

The previous prime is 31002122111. The next prime is 31002122149. The reversal of 31002122121 is 12122120013.

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 31002122121 - 2⁶ = 31002122057 is a prime.

It is a super-2 number, since 2×31002122121² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31002122121.

It is not an unprimeable number, because it can be changed into a prime (31002122111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5167020351 + ... + 5167020356.

It is an arithmetic number, because the mean of its divisors is an integer number (10334040708).

Almost surely, 2^31002122121 is an apocalyptic number.

It is an amenable number.

31002122121 is a deficient number, since it is larger than the sum of its proper divisors (10334040711).

31002122121 is a wasteful number, since it uses less digits than its factorization.

31002122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10334040710.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31002122121 its reverse (12122120013), we get a palindrome (43124242134).

The spelling of 31002122121 in words is "thirty-one billion, two million, one hundred twenty-two thousand, one hundred twenty-one".