31110111221 has 12 divisors (see below), whose sum is σ = 36527537088. Its totient is φ = 26416591992.

The previous prime is 31110111191. The next prime is 31110111289. The reversal of 31110111221 is 12211101113.

It is not a de Polignac number, because 31110111221 - 2⁶ = 31110111157 is a prime.

It is a super-2 number, since 2×31110111221² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31110111196 and 31110111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31110111421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2961581 + ... + 2972066.

It is an arithmetic number, because the mean of its divisors is an integer number (3043961424).

Almost surely, 2^31110111221 is an apocalyptic number.

It is an amenable number.

31110111221 is a deficient number, since it is larger than the sum of its proper divisors (5417425867).

31110111221 is a wasteful number, since it uses less digits than its factorization.

31110111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5933768 (or 5933761 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 31110111221 its reverse (12211101113), we get a palindrome (43321212334).

The spelling of 31110111221 in words is "thirty-one billion, one hundred ten million, one hundred eleven thousand, two hundred twenty-one".