31120313221 has 8 divisors (see below), whose sum is σ = 32390938080. Its totient is φ = 29862855792.

The previous prime is 31120313179. The next prime is 31120313251. The reversal of 31120313221 is 12231302113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31120313221 - 2¹⁵ = 31120280453 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 (31120313251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3287035 + ... + 3296488.

It is an arithmetic number, because the mean of its divisors is an integer number (4048867260).

Almost surely, 2^31120313221 is an apocalyptic number.

It is an amenable number.

31120313221 is a deficient number, since it is larger than the sum of its proper divisors (1270624859).

31120313221 is a wasteful number, since it uses less digits than its factorization.

31120313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6583715.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31120313221 its reverse (12231302113), we get a palindrome (43351615334).

The spelling of 31120313221 in words is "thirty-one billion, one hundred twenty million, three hundred thirteen thousand, two hundred twenty-one".