31113220113221 has 16 divisors (see below), whose sum is σ = 31980673105920. Its totient is φ = 30252317160240.

The previous prime is 31113220113181. The next prime is 31113220113229. The reversal of 31113220113221 is 12231102231113.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31113220113221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113220113229) 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, 523136516 + ... + 523195986.

It is an arithmetic number, because the mean of its divisors is an integer number (1998792069120).

Almost surely, 2^{31113220113221} is an apocalyptic number.

It is an amenable number.

31113220113221 is a deficient number, since it is larger than the sum of its proper divisors (867452992699).

31113220113221 is a wasteful number, since it uses less digits than its factorization.

31113220113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114296.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31113220113221 its reverse (12231102231113), we get a palindrome (43344322344334).

The spelling of 31113220113221 in words is "thirty-one trillion, one hundred thirteen billion, two hundred twenty million, one hundred thirteen thousand, two hundred twenty-one".