22011002221991 has 2 divisors, whose sum is σ = 22011002221992. Its totient is φ = 22011002221990.

The previous prime is 22011002221963. The next prime is 22011002222029. The reversal of 22011002221991 is 19912220011022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22011002221991 - 2²⁶ = 22010935113127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22011002221921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11005501110995 + 11005501110996.

It is an arithmetic number, because the mean of its divisors is an integer number (11005501110996).

Almost surely, 2^{22011002221991} is an apocalyptic number.

22011002221991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22011002221991 is an equidigital number, since it uses as much as digits as its factorization.

22011002221991 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 32.

The spelling of 22011002221991 in words is "twenty-two trillion, eleven billion, two million, two hundred twenty-one thousand, nine hundred ninety-one".