31314233221 has 4 divisors (see below), whose sum is σ = 31710616000. Its totient is φ = 30917850444.

The previous prime is 31314233219. The next prime is 31314233233. The reversal of 31314233221 is 12233241313.

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 a cyclic number.

It is not a de Polignac number, because 31314233221 - 2¹ = 31314233219 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 (31314233521) 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, 198191271 + ... + 198191428.

It is an arithmetic number, because the mean of its divisors is an integer number (7927654000).

Almost surely, 2^31314233221 is an apocalyptic number.

It is an amenable number.

31314233221 is a deficient number, since it is larger than the sum of its proper divisors (396382779).

31314233221 is an equidigital number, since it uses as much as digits as its factorization.

31314233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396382778.

The product of its digits is 2592, while the sum is 25.

Adding to 31314233221 its reverse (12233241313), we get a palindrome (43547474534).

The spelling of 31314233221 in words is "thirty-one billion, three hundred fourteen million, two hundred thirty-three thousand, two hundred twenty-one".