22170899 has 4 divisors (see below), whose sum is σ = 22222536. Its totient is φ = 22119264.

The previous prime is 22170851. The next prime is 22170931. The reversal of 22170899 is 99807122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99807122 = 2 ⋅49903561.

It is a cyclic number.

It is not a de Polignac number, because 22170899 - 2²⁰ = 21122323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22170809) 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, 25169 + ... + 26034.

It is an arithmetic number, because the mean of its divisors is an integer number (5555634).

Almost surely, 2^22170899 is an apocalyptic number.

22170899 is a deficient number, since it is larger than the sum of its proper divisors (51637).

22170899 is an equidigital number, since it uses as much as digits as its factorization.

22170899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51636.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 22170899 is about 4708.5984114171. The cubic root of 22170899 is about 280.9276165178.

The spelling of 22170899 in words is "twenty-two million, one hundred seventy thousand, eight hundred ninety-nine".