31121212121121 has 8 divisors (see below), whose sum is σ = 41512629499744. Its totient is φ = 20738634744960.

The previous prime is 31121212121101. The next prime is 31121212121137. The reversal of 31121212121121 is 12112121212113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31121212121121 - 2⁶ = 31121212121057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121212121101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2209992400 + ... + 2210006481.

It is an arithmetic number, because the mean of its divisors is an integer number (5189078687468).

Almost surely, 2^{31121212121121} is an apocalyptic number.

It is an amenable number.

31121212121121 is a deficient number, since it is larger than the sum of its proper divisors (10391417378623).

31121212121121 is a wasteful number, since it uses less digits than its factorization.

31121212121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4420001231.

The product of its digits is 96, while the sum is 21.

Adding to 31121212121121 its reverse (12112121212113), we get a palindrome (43233333333234).

It can be divided in two parts, 3112121212112 and 1, that added together give a palindrome (3112121212113).

The spelling of 31121212121121 in words is "thirty-one trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twenty-one".