22102221991 has 2 divisors, whose sum is σ = 22102221992. Its totient is φ = 22102221990.

The previous prime is 22102221989. The next prime is 22102222033. The reversal of 22102221991 is 19912220122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22102221991 - 2¹ = 22102221989 is a prime.

Together with 22102221989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22102221901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11051110995 + 11051110996.

It is an arithmetic number, because the mean of its divisors is an integer number (11051110996).

Almost surely, 2^22102221991 is an apocalyptic number.

22102221991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22102221991 is an equidigital number, since it uses as much as digits as its factorization.

22102221991 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 31.

The spelling of 22102221991 in words is "twenty-two billion, one hundred two million, two hundred twenty-one thousand, nine hundred ninety-one".