22129165 has 4 divisors (see below), whose sum is σ = 26555004. Its totient is φ = 17703328.

The previous prime is 22129157. The next prime is 22129169. The reversal of 22129165 is 56192122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9872164 + 12257001 = 3142^2 + 3501^2 .

It is a cyclic number.

It is not a de Polignac number, because 22129165 - 2³ = 22129157 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 (22129169) 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, 2212912 + ... + 2212921.

It is an arithmetic number, because the mean of its divisors is an integer number (6638751).

Almost surely, 2^22129165 is an apocalyptic number.

It is an amenable number.

22129165 is a deficient number, since it is larger than the sum of its proper divisors (4425839).

22129165 is an equidigital number, since it uses as much as digits as its factorization.

22129165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4425838.

The product of its digits is 2160, while the sum is 28.

The square root of 22129165 is about 4704.1646442275. The cubic root of 22129165 is about 280.7512351973.

The spelling of 22129165 in words is "twenty-two million, one hundred twenty-nine thousand, one hundred sixty-five".