22181109 has 16 divisors (see below), whose sum is σ = 30369600. Its totient is φ = 14395136.

The previous prime is 22181069. The next prime is 22181147. The reversal of 22181109 is 90118122.

It is a cyclic number.

It is not a de Polignac number, because 22181109 - 2⁷ = 22180981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22181149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19447 + ... + 20555.

It is an arithmetic number, because the mean of its divisors is an integer number (1898100).

It is the magic constant of a 354 × 354 magic square.

Almost surely, 2^22181109 is an apocalyptic number.

It is an amenable number.

22181109 is a deficient number, since it is larger than the sum of its proper divisors (8188491).

22181109 is a wasteful number, since it uses less digits than its factorization.

22181109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 22181109 is about 4709.6824733733. The cubic root of 22181109 is about 280.9707335603.

The spelling of 22181109 in words is "twenty-two million, one hundred eighty-one thousand, one hundred nine".