22122111109991 has 2 divisors, whose sum is σ = 22122111109992. Its totient is φ = 22122111109990.

The previous prime is 22122111109981. The next prime is 22122111110009. The reversal of 22122111109991 is 19990111122122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22122111109991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22122111109951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11061055554995 + 11061055554996.

It is an arithmetic number, because the mean of its divisors is an integer number (11061055554996).

Almost surely, 2^{22122111109991} is an apocalyptic number.

22122111109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22122111109991 is an equidigital number, since it uses as much as digits as its factorization.

22122111109991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 41.

The spelling of 22122111109991 in words is "twenty-two trillion, one hundred twenty-two billion, one hundred eleven million, one hundred nine thousand, nine hundred ninety-one".