22121012001997 has 2 divisors, whose sum is σ = 22121012001998. Its totient is φ = 22121012001996.

The previous prime is 22121012001971. The next prime is 22121012002021. The reversal of 22121012001997 is 79910021012122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21981413372356 + 139598629641 = 4688434^2 + 373629^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121012001997 - 2¹⁵ = 22121011969229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121012001197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060506000998 + 11060506000999.

It is an arithmetic number, because the mean of its divisors is an integer number (11060506000999).

Almost surely, 2^{22121012001997} is an apocalyptic number.

It is an amenable number.

22121012001997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121012001997 is an equidigital number, since it uses as much as digits as its factorization.

22121012001997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The spelling of 22121012001997 in words is "twenty-two trillion, one hundred twenty-one billion, twelve million, one thousand, nine hundred ninety-seven".