22121223931 has 2 divisors, whose sum is σ = 22121223932. Its totient is φ = 22121223930.

The previous prime is 22121223913. The next prime is 22121223937. The reversal of 22121223931 is 13932212122.

Together with previous prime (22121223913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22121223931 - 2⁹ = 22121223419 is a prime.

It is a super-2 number, since 2×22121223931² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22121223931.

It is not a weakly prime, because it can be changed into another prime (22121223937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060611965 + 11060611966.

It is an arithmetic number, because the mean of its divisors is an integer number (11060611966).

Almost surely, 2^22121223931 is an apocalyptic number.

22121223931 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121223931 is an equidigital number, since it uses as much as digits as its factorization.

22121223931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The spelling of 22121223931 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-three thousand, nine hundred thirty-one".