211221121110091 has 2 divisors, whose sum is σ = 211221121110092. Its totient is φ = 211221121110090.

The previous prime is 211221121110031. The next prime is 211221121110133. The reversal of 211221121110091 is 190011121122112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211221121110091 - 2²⁵ = 211221087555659 is a prime.

It is a super-2 number, since 2×211221121110091² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211221121110031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610560555045 + 105610560555046.

It is an arithmetic number, because the mean of its divisors is an integer number (105610560555046).

Almost surely, 2^{211221121110091} is an apocalyptic number.

211221121110091 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221121110091 is an equidigital number, since it uses as much as digits as its factorization.

211221121110091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 25.

The spelling of 211221121110091 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred ten thousand, ninety-one".