22157189 has 4 divisors (see below), whose sum is σ = 22921260. Its totient is φ = 21393120.

The previous prime is 22157167. The next prime is 22157207. The reversal of 22157189 is 98175122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98175122 = 2 ⋅49087561.

It can be written as a sum of positive squares in 2 ways, for example, as 12285025 + 9872164 = 3505^2 + 3142^2 .

It is a cyclic number.

It is not a de Polignac number, because 22157189 - 2¹² = 22153093 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 (22157129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381992 + ... + 382049.

It is an arithmetic number, because the mean of its divisors is an integer number (5730315).

Almost surely, 2^22157189 is an apocalyptic number.

22157189 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

22157189 is a deficient number, since it is larger than the sum of its proper divisors (764071).

22157189 is an equidigital number, since it uses as much as digits as its factorization.

22157189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764070.

The product of its digits is 10080, while the sum is 35.

The square root of 22157189 is about 4707.1423390418. The cubic root of 22157189 is about 280.8696980757.

The spelling of 22157189 in words is "twenty-two million, one hundred fifty-seven thousand, one hundred eighty-nine".