31311244321 has 4 divisors (see below), whose sum is σ = 35784279232. Its totient is φ = 26838209412.

The previous prime is 31311244303. The next prime is 31311244333. The reversal of 31311244321 is 12344211313.

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 31311244321 - 2¹¹ = 31311242273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311244021) 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, 2236517445 + ... + 2236517458.

It is an arithmetic number, because the mean of its divisors is an integer number (8946069808).

Almost surely, 2^31311244321 is an apocalyptic number.

It is an amenable number.

31311244321 is a deficient number, since it is larger than the sum of its proper divisors (4473034911).

31311244321 is an equidigital number, since it uses as much as digits as its factorization.

31311244321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473034910.

The product of its digits is 1728, while the sum is 25.

Adding to 31311244321 its reverse (12344211313), we get a palindrome (43655455634).

The spelling of 31311244321 in words is "thirty-one billion, three hundred eleven million, two hundred forty-four thousand, three hundred twenty-one".