22220191 has 4 divisors (see below), whose sum is σ = 25394512. Its totient is φ = 19045872.

The previous prime is 22220171. The next prime is 22220203. The reversal of 22220191 is 19102222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19102222 = 2 ⋅9551111.

It is a cyclic number.

It is not a de Polignac number, because 22220191 - 2¹⁹ = 21695903 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 (22220131) 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, 1587150 + ... + 1587163.

It is an arithmetic number, because the mean of its divisors is an integer number (6348628).

Almost surely, 2^22220191 is an apocalyptic number.

22220191 is a deficient number, since it is larger than the sum of its proper divisors (3174321).

22220191 is an equidigital number, since it uses as much as digits as its factorization.

22220191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174320.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 22220191 is about 4713.8297593358. The cubic root of 22220191 is about 281.1356555104.

The spelling of 22220191 in words is "twenty-two million, two hundred twenty thousand, one hundred ninety-one".