22005441891 has 6 divisors (see below), whose sum is σ = 31785638300. Its totient is φ = 14670294588.

The previous prime is 22005441859. The next prime is 22005441911. The reversal of 22005441891 is 19814450022.

22005441891 is a `hidden beast` number, since 2 + 20 + 0 + 544 + 1 + 8 + 91 = 666.

It is not a de Polignac number, because 22005441891 - 2⁵ = 22005441859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22005441851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1222524541 + ... + 1222524558.

Almost surely, 2^22005441891 is an apocalyptic number.

22005441891 is a deficient number, since it is larger than the sum of its proper divisors (9780196409).

22005441891 is a wasteful number, since it uses less digits than its factorization.

22005441891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445049105 (or 2445049102 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 22005441891 in words is "twenty-two billion, five million, four hundred forty-one thousand, eight hundred ninety-one".