22011221220997 has 2 divisors, whose sum is σ = 22011221220998. Its totient is φ = 22011221220996.

The previous prime is 22011221220991. The next prime is 22011221221001. The reversal of 22011221220997 is 79902212211022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12881825443876 + 9129395777121 = 3589126^2 + 3021489^2 .

It is a cyclic number.

It is not a de Polignac number, because 22011221220997 - 2³⁵ = 21976861482629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22011221220991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11005610610498 + 11005610610499.

It is an arithmetic number, because the mean of its divisors is an integer number (11005610610499).

Almost surely, 2^{22011221220997} is an apocalyptic number.

It is an amenable number.

22011221220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22011221220997 is an equidigital number, since it uses as much as digits as its factorization.

22011221220997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 22011221220997 in words is "twenty-two trillion, eleven billion, two hundred twenty-one million, two hundred twenty thousand, nine hundred ninety-seven".