211221201120991 has 2 divisors, whose sum is σ = 211221201120992. Its totient is φ = 211221201120990.

The previous prime is 211221201120977. The next prime is 211221201121019. The reversal of 211221201120991 is 199021102122112.

It is a happy number.

211221201120991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211221201120991 - 2²⁷ = 211221066903263 is a prime.

It is a super-2 number, since 2×211221201120991² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221201120901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610600560495 + 105610600560496.

It is an arithmetic number, because the mean of its divisors is an integer number (105610600560496).

Almost surely, 2^{211221201120991} is an apocalyptic number.

211221201120991 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221201120991 is an equidigital number, since it uses as much as digits as its factorization.

211221201120991 is an evil number, because the sum of its binary digits is even.

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

The spelling of 211221201120991 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred one million, one hundred twenty thousand, nine hundred ninety-one".