22101009991 has 2 divisors, whose sum is σ = 22101009992. Its totient is φ = 22101009990.

The previous prime is 22101009989. The next prime is 22101010049. The reversal of 22101009991 is 19990010122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22101009991 - 2¹ = 22101009989 is a prime.

Together with 22101009989, 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 (22101009391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11050504995 + 11050504996.

It is an arithmetic number, because the mean of its divisors is an integer number (11050504996).

Almost surely, 2^22101009991 is an apocalyptic number.

22101009991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22101009991 is an equidigital number, since it uses as much as digits as its factorization.

22101009991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 22101009991 in words is "twenty-two billion, one hundred one million, nine thousand, nine hundred ninety-one".