31120213305221 has 16 divisors (see below), whose sum is σ = 31529687788800. Its totient is φ = 30711131505600.

The previous prime is 31120213305193. The next prime is 31120213305277. The reversal of 31120213305221 is 12250331202113.

It is a cyclic number.

It is not a de Polignac number, because 31120213305221 - 2²² = 31120209110917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120213305281) 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, 2427277991 + ... + 2427290811.

It is an arithmetic number, because the mean of its divisors is an integer number (1970605486800).

Almost surely, 2^{31120213305221} is an apocalyptic number.

It is an amenable number.

31120213305221 is a deficient number, since it is larger than the sum of its proper divisors (409474483579).

31120213305221 is a wasteful number, since it uses less digits than its factorization.

31120213305221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25660.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 31120213305221 its reverse (12250331202113), we get a palindrome (43370544507334).

The spelling of 31120213305221 in words is "thirty-one trillion, one hundred twenty billion, two hundred thirteen million, three hundred five thousand, two hundred twenty-one".