12313122221 has 4 divisors (see below), whose sum is σ = 12710319744. Its totient is φ = 11915924700.

The previous prime is 12313122193. The next prime is 12313122271. The reversal of 12313122221 is 12222131321.

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-12313122221 is a prime.

It is a super-2 number, since 2×12313122221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12313122193 and 12313122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12313122271) 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, 198598715 + ... + 198598776.

It is an arithmetic number, because the mean of its divisors is an integer number (3177579936).

Almost surely, 2^12313122221 is an apocalyptic number.

It is an amenable number.

12313122221 is a deficient number, since it is larger than the sum of its proper divisors (397197523).

12313122221 is an equidigital number, since it uses as much as digits as its factorization.

12313122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397197522.

The product of its digits is 288, while the sum is 20.

Adding to 12313122221 its reverse (12222131321), we get a palindrome (24535253542).

The spelling of 12313122221 in words is "twelve billion, three hundred thirteen million, one hundred twenty-two thousand, two hundred twenty-one".