22119991 has 4 divisors (see below), whose sum is σ = 22145184. Its totient is φ = 22094800.

The previous prime is 22119989. The next prime is 22120031. The reversal of 22119991 is 19991122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22119991 - 2¹ = 22119989 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 (22119961) 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, 11230 + ... + 13051.

It is an arithmetic number, because the mean of its divisors is an integer number (5536296).

Almost surely, 2^22119991 is an apocalyptic number.

22119991 is a deficient number, since it is larger than the sum of its proper divisors (25193).

22119991 is an equidigital number, since it uses as much as digits as its factorization.

22119991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25192.

The product of its digits is 2916, while the sum is 34.

The square root of 22119991 is about 4703.1894497245. The cubic root of 22119991 is about 280.7124331935.

The spelling of 22119991 in words is "twenty-two million, one hundred nineteen thousand, nine hundred ninety-one".