21222012021191 has 2 divisors, whose sum is σ = 21222012021192. Its totient is φ = 21222012021190.

The previous prime is 21222012021157. The next prime is 21222012021227. The reversal of 21222012021191 is 19112021022212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222012021191 - 2²⁶ = 21221944912327 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222012021191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222012021121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611006010595 + 10611006010596.

It is an arithmetic number, because the mean of its divisors is an integer number (10611006010596).

Almost surely, 2^{21222012021191} is an apocalyptic number.

21222012021191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222012021191 is an equidigital number, since it uses as much as digits as its factorization.

21222012021191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 21222012021191 in words is "twenty-one trillion, two hundred twenty-two billion, twelve million, twenty-one thousand, one hundred ninety-one".