22122211011991 has 2 divisors, whose sum is σ = 22122211011992. Its totient is φ = 22122211011990.

The previous prime is 22122211011977. The next prime is 22122211012009. The reversal of 22122211011991 is 19911011222122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22122211011991 - 2²⁹ = 22121674141079 is a prime.

It is a super-4 number, since 4×22122211011991⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22122211011931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11061105505995 + 11061105505996.

It is an arithmetic number, because the mean of its divisors is an integer number (11061105505996).

Almost surely, 2^{22122211011991} is an apocalyptic number.

22122211011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22122211011991 is an equidigital number, since it uses as much as digits as its factorization.

22122211011991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 22122211011991 in words is "twenty-two trillion, one hundred twenty-two billion, two hundred eleven million, eleven thousand, nine hundred ninety-one".