22101031991 has 2 divisors, whose sum is σ = 22101031992. Its totient is φ = 22101031990.

The previous prime is 22101031957. The next prime is 22101032029. The reversal of 22101031991 is 19913010122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22101031991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22101001991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11050515995 + 11050515996.

It is an arithmetic number, because the mean of its divisors is an integer number (11050515996).

Almost surely, 2^22101031991 is an apocalyptic number.

22101031991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22101031991 is an equidigital number, since it uses as much as digits as its factorization.

22101031991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 22101031991 in words is "twenty-two billion, one hundred one million, thirty-one thousand, nine hundred ninety-one".