22191899 has 4 divisors (see below), whose sum is σ = 22201440. Its totient is φ = 22182360.

The previous prime is 22191893. The next prime is 22191901. The reversal of 22191899 is 99819122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22191899 - 2⁸ = 22191643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22191893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1262 + ... + 6780.

It is an arithmetic number, because the mean of its divisors is an integer number (5550360).

Almost surely, 2^22191899 is an apocalyptic number.

22191899 is a deficient number, since it is larger than the sum of its proper divisors (9541).

22191899 is an equidigital number, since it uses as much as digits as its factorization.

22191899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9540.

The product of its digits is 23328, while the sum is 41.

The square root of 22191899 is about 4710.8278465679. The cubic root of 22191899 is about 281.0162855773.

The spelling of 22191899 in words is "twenty-two million, one hundred ninety-one thousand, eight hundred ninety-nine".