22101000111991 has 2 divisors, whose sum is σ = 22101000111992. Its totient is φ = 22101000111990.

The previous prime is 22101000111947. The next prime is 22101000112003. The reversal of 22101000111991 is 19911100010122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22101000111991 - 2¹³ = 22101000103799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22101000111941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11050500055995 + 11050500055996.

It is an arithmetic number, because the mean of its divisors is an integer number (11050500055996).

Almost surely, 2^{22101000111991} is an apocalyptic number.

22101000111991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22101000111991 is an equidigital number, since it uses as much as digits as its factorization.

22101000111991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 22101000111991 in words is "twenty-two trillion, one hundred one billion, one hundred eleven thousand, nine hundred ninety-one".