22121000979817 has 2 divisors, whose sum is σ = 22121000979818. Its totient is φ = 22121000979816.

The previous prime is 22121000979811. The next prime is 22121000979929. The reversal of 22121000979817 is 71897900012122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15370508434576 + 6750492545241 = 3920524^2 + 2598171^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121000979817 - 2¹⁵ = 22121000947049 is a prime.

It is not a weakly prime, because it can be changed into another prime (22121000979811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060500489908 + 11060500489909.

It is an arithmetic number, because the mean of its divisors is an integer number (11060500489909).

Almost surely, 2^{22121000979817} is an apocalyptic number.

It is an amenable number.

22121000979817 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121000979817 is an equidigital number, since it uses as much as digits as its factorization.

22121000979817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 49.

The spelling of 22121000979817 in words is "twenty-two trillion, one hundred twenty-one billion, nine hundred seventy-nine thousand, eight hundred seventeen".