22191121 has 4 divisors (see below), whose sum is σ = 22503744. Its totient is φ = 21878500.

The previous prime is 22191101. The next prime is 22191163. The reversal of 22191121 is 12119122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22191121 - 2¹¹ = 22189073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22191101) 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, 156205 + ... + 156346.

It is an arithmetic number, because the mean of its divisors is an integer number (5625936).

Almost surely, 2^22191121 is an apocalyptic number.

It is an amenable number.

22191121 is a deficient number, since it is larger than the sum of its proper divisors (312623).

22191121 is an equidigital number, since it uses as much as digits as its factorization.

22191121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312622.

The product of its digits is 72, while the sum is 19.

The square root of 22191121 is about 4710.7452701245. The cubic root of 22191121 is about 281.0130015978.

The spelling of 22191121 in words is "twenty-two million, one hundred ninety-one thousand, one hundred twenty-one".