22199121 has 12 divisors (see below), whose sum is σ = 36646272. Its totient is φ = 12685176.

The previous prime is 22199119. The next prime is 22199147. The reversal of 22199121 is 12199122.

It is not a de Polignac number, because 22199121 - 2¹ = 22199119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22199171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176121 + ... + 176246.

It is an arithmetic number, because the mean of its divisors is an integer number (3053856).

Almost surely, 2^22199121 is an apocalyptic number.

22199121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22199121 is a deficient number, since it is larger than the sum of its proper divisors (14447151).

22199121 is a wasteful number, since it uses less digits than its factorization.

22199121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352380 (or 352377 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 22199121 is about 4711.5943161524. The cubic root of 22199121 is about 281.0467663622.

Subtracting from 22199121 its reverse (12199122), we obtain a palindrome (9999999).

The spelling of 22199121 in words is "twenty-two million, one hundred ninety-nine thousand, one hundred twenty-one".