31120130310221 has 4 divisors (see below), whose sum is σ = 31120155191100. Its totient is φ = 31120105429344.

The previous prime is 31120130310197. The next prime is 31120130310239. The reversal of 31120130310221 is 12201303102113.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13704907656196 + 17415222654025 = 3702014^2 + 4173155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31120130310221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31120130310193 and 31120130310202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120130310121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10459106 + ... + 13100883.

It is an arithmetic number, because the mean of its divisors is an integer number (7780038797775).

Almost surely, 2^{31120130310221} is an apocalyptic number.

It is an amenable number.

31120130310221 is a deficient number, since it is larger than the sum of its proper divisors (24880879).

31120130310221 is a wasteful number, since it uses less digits than its factorization.

31120130310221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24880878.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31120130310221 its reverse (12201303102113), we get a palindrome (43321433412334).

The spelling of 31120130310221 in words is "thirty-one trillion, one hundred twenty billion, one hundred thirty million, three hundred ten thousand, two hundred twenty-one".