31311102322221 has 16 divisors (see below), whose sum is σ = 42320720097984. Its totient is φ = 20589717343104.

The previous prime is 31311102322207. The next prime is 31311102322229. The reversal of 31311102322221 is 12222320111313.

It is not a de Polignac number, because 31311102322221 - 2²⁹ = 31310565451309 is a prime.

It is a super-3 number, since 3×31311102322221³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31311102322191 and 31311102322200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311102322229) 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 15 ways as a sum of consecutive naturals, for example, 242555635 + ... + 242684688.

It is an arithmetic number, because the mean of its divisors is an integer number (2645045006124).

Almost surely, 2^{31311102322221} is an apocalyptic number.

It is an amenable number.

31311102322221 is a deficient number, since it is larger than the sum of its proper divisors (11009617775763).

31311102322221 is a wasteful number, since it uses less digits than its factorization.

31311102322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485240620.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31311102322221 its reverse (12222320111313), we get a palindrome (43533422433534).

The spelling of 31311102322221 in words is "thirty-one trillion, three hundred eleven billion, one hundred two million, three hundred twenty-two thousand, two hundred twenty-one".