31102313221 has 4 divisors (see below), whose sum is σ = 35545500832. Its totient is φ = 26659125612.

The previous prime is 31102313197. The next prime is 31102313233. The reversal of 31102313221 is 12231320113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31102313221 - 2⁵ = 31102313189 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 (31102313251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2221593795 + ... + 2221593808.

It is an arithmetic number, because the mean of its divisors is an integer number (8886375208).

Almost surely, 2^31102313221 is an apocalyptic number.

It is an amenable number.

31102313221 is a deficient number, since it is larger than the sum of its proper divisors (4443187611).

31102313221 is an equidigital number, since it uses as much as digits as its factorization.

31102313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4443187610.

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

Adding to 31102313221 its reverse (12231320113), we get a palindrome (43333633334).

The spelling of 31102313221 in words is "thirty-one billion, one hundred two million, three hundred thirteen thousand, two hundred twenty-one".