22000951991 has 2 divisors, whose sum is σ = 22000951992. Its totient is φ = 22000951990.

The previous prime is 22000951963. The next prime is 22000951997. The reversal of 22000951991 is 19915900022.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22000951991 - 2⁶ = 22000951927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22000951997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000475995 + 11000475996.

It is an arithmetic number, because the mean of its divisors is an integer number (11000475996).

Almost surely, 2^22000951991 is an apocalyptic number.

22000951991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22000951991 is an equidigital number, since it uses as much as digits as its factorization.

22000951991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 38.

The spelling of 22000951991 in words is "twenty-two billion, nine hundred fifty-one thousand, nine hundred ninety-one".