21441194991 has 10 divisors (see below), whose sum is σ = 32029439552. Its totient is φ = 14294129940.

The previous prime is 21441194977. The next prime is 21441195023. The reversal of 21441194991 is 19949114412.

21441194991 is a `hidden beast` number, since 2 + 1 + 44 + 119 + 499 + 1 = 666.

It is not a de Polignac number, because 21441194991 - 2⁹ = 21441194479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441194911) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 132352975 + ... + 132353136.

Almost surely, 2^21441194991 is an apocalyptic number.

21441194991 is a deficient number, since it is larger than the sum of its proper divisors (10588244561).

21441194991 is an equidigital number, since it uses as much as digits as its factorization.

21441194991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264706123 (or 264706114 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The spelling of 21441194991 in words is "twenty-one billion, four hundred forty-one million, one hundred ninety-four thousand, nine hundred ninety-one".