21122210097991 has 2 divisors, whose sum is σ = 21122210097992. Its totient is φ = 21122210097990.

The previous prime is 21122210097977. The next prime is 21122210098001. The reversal of 21122210097991 is 19979001222112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21122210097991 - 2⁹ = 21122210097479 is a prime.

It is a super-2 number, since 2×21122210097991² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122210097931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561105048995 + 10561105048996.

It is an arithmetic number, because the mean of its divisors is an integer number (10561105048996).

Almost surely, 2^{21122210097991} is an apocalyptic number.

21122210097991 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122210097991 is an equidigital number, since it uses as much as digits as its factorization.

21122210097991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 46.

The spelling of 21122210097991 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred ten million, ninety-seven thousand, nine hundred ninety-one".