31212113122211 has 16 divisors (see below), whose sum is σ = 36836064399360. Its totient is φ = 25880106385440.

The previous prime is 31212113122163. The next prime is 31212113122231. The reversal of 31212113122211 is 11222131121213.

It is a cyclic number.

It is not a de Polignac number, because 31212113122211 - 2¹⁰ = 31212113121187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212113122231) 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, 27570791 + ... + 28680528.

It is an arithmetic number, because the mean of its divisors is an integer number (2302254024960).

Almost surely, 2^{31212113122211} is an apocalyptic number.

31212113122211 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31212113122211 is a deficient number, since it is larger than the sum of its proper divisors (5623951277149).

31212113122211 is a wasteful number, since it uses less digits than its factorization.

31212113122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56253914.

The product of its digits is 288, while the sum is 23.

Adding to 31212113122211 its reverse (11222131121213), we get a palindrome (42434244243424).

The spelling of 31212113122211 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirteen million, one hundred twenty-two thousand, two hundred eleven".