22111000111997 has 2 divisors, whose sum is σ = 22111000111998. Its totient is φ = 22111000111996.

The previous prime is 22111000111961. The next prime is 22111000112009. The reversal of 22111000111997 is 79911100011122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20189466306361 + 1921533805636 = 4493269^2 + 1386194^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111000111997 - 2⁶ = 22111000111933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22111000111927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11055500055998 + 11055500055999.

It is an arithmetic number, because the mean of its divisors is an integer number (11055500055999).

Almost surely, 2^{22111000111997} is an apocalyptic number.

It is an amenable number.

22111000111997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22111000111997 is an equidigital number, since it uses as much as digits as its factorization.

22111000111997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 35.

The spelling of 22111000111997 in words is "twenty-two trillion, one hundred eleven billion, one hundred eleven thousand, nine hundred ninety-seven".