21446112191 has 24 divisors (see below), whose sum is σ = 25082597376. Its totient is φ = 18283149360.

The previous prime is 21446112169. The next prime is 21446112223. The reversal of 21446112191 is 19121164412.

It is a de Polignac number, because none of the positive numbers 2^k-21446112191 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 (21446112131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7749290 + ... + 7752056.

It is an arithmetic number, because the mean of its divisors is an integer number (1045108224).

Almost surely, 2^21446112191 is an apocalyptic number.

21446112191 is a deficient number, since it is larger than the sum of its proper divisors (3636485185).

21446112191 is a wasteful number, since it uses less digits than its factorization.

21446112191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3579 (or 3572 counting only the distinct ones).

The product of its digits is 3456, while the sum is 32.

The spelling of 21446112191 in words is "twenty-one billion, four hundred forty-six million, one hundred twelve thousand, one hundred ninety-one".