22015993121 has 2 divisors, whose sum is σ = 22015993122. Its totient is φ = 22015993120.

The previous prime is 22015993099. The next prime is 22015993127. The reversal of 22015993121 is 12139951022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21560810896 + 455182225 = 146836^2 + 21335^2 .

It is a cyclic number.

It is not a de Polignac number, because 22015993121 - 2⁶ = 22015993057 is a prime.

It is not a weakly prime, because it can be changed into another prime (22015993127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11007996560 + 11007996561.

It is an arithmetic number, because the mean of its divisors is an integer number (11007996561).

Almost surely, 2^22015993121 is an apocalyptic number.

It is an amenable number.

22015993121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22015993121 is an equidigital number, since it uses as much as digits as its factorization.

22015993121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The spelling of 22015993121 in words is "twenty-two billion, fifteen million, nine hundred ninety-three thousand, one hundred twenty-one".