31312122230221 has 4 divisors (see below), whose sum is σ = 35785282548832. Its totient is φ = 26838961911612.

The previous prime is 31312122230161. The next prime is 31312122230237. The reversal of 31312122230221 is 12203222121313.

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 a de Polignac number, because none of the positive numbers 2^k-31312122230221 is a prime.

It is a super-5 number, since 5×31312122230221⁵ (a number of 69 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312122230251) 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, 2236580159295 + ... + 2236580159308.

It is an arithmetic number, because the mean of its divisors is an integer number (8946320637208).

Almost surely, 2^{31312122230221} is an apocalyptic number.

It is an amenable number.

31312122230221 is a deficient number, since it is larger than the sum of its proper divisors (4473160318611).

31312122230221 is an equidigital number, since it uses as much as digits as its factorization.

31312122230221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473160318610.

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

Adding to 31312122230221 its reverse (12203222121313), we get a palindrome (43515344351534).

The spelling of 31312122230221 in words is "thirty-one trillion, three hundred twelve billion, one hundred twenty-two million, two hundred thirty thousand, two hundred twenty-one".