31212102211121 has 16 divisors (see below), whose sum is σ = 33630401524944. Its totient is φ = 28796287878144.

The previous prime is 31212102211063. The next prime is 31212102211127. The reversal of 31212102211121 is 12111220121213.

It can be written as a sum of positive squares in 8 ways, for example, as 94225055521 + 31117877155600 = 306961^2 + 5578340^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212102211121 - 2¹⁰ = 31212102210097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212102211093 and 31212102211102.

It is not an unprimeable number, because it can be changed into a prime (31212102211127) 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, 208706045 + ... + 208855541.

It is an arithmetic number, because the mean of its divisors is an integer number (2101900095309).

Almost surely, 2^{31212102211121} is an apocalyptic number.

It is an amenable number.

31212102211121 is a deficient number, since it is larger than the sum of its proper divisors (2418299313823).

31212102211121 is a wasteful number, since it uses less digits than its factorization.

31212102211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157700.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 31212102211121 its reverse (12111220121213), we get a palindrome (43323322332334).

The spelling of 31212102211121 in words is "thirty-one trillion, two hundred twelve billion, one hundred two million, two hundred eleven thousand, one hundred twenty-one".