22125209 has 4 divisors (see below), whose sum is σ = 22455504. Its totient is φ = 21794916.

The previous prime is 22125197. The next prime is 22125217. The reversal of 22125209 is 90252122.

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 22125209 - 2¹⁶ = 22059673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22125239) 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, 165047 + ... + 165180.

It is an arithmetic number, because the mean of its divisors is an integer number (5613876).

Almost surely, 2^22125209 is an apocalyptic number.

It is an amenable number.

22125209 is a deficient number, since it is larger than the sum of its proper divisors (330295).

22125209 is an equidigital number, since it uses as much as digits as its factorization.

22125209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330294.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 22125209 is about 4703.7441469536. The cubic root of 22125209 is about 280.7345043645.

The spelling of 22125209 in words is "twenty-two million, one hundred twenty-five thousand, two hundred nine".