22184221 has 4 divisors (see below), whose sum is σ = 22194172. Its totient is φ = 22174272.

The previous prime is 22184209. The next prime is 22184231. The reversal of 22184221 is 12248122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 21958596 + 225625 = 4686^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 22184221 - 2⁷ = 22184093 is a prime.

It is a super-2 number, since 2×22184221² = 984279322753682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22184192 and 22184201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22184231) 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, 85 + ... + 6661.

It is an arithmetic number, because the mean of its divisors is an integer number (5548543).

Almost surely, 2^22184221 is an apocalyptic number.

It is an amenable number.

22184221 is a deficient number, since it is larger than the sum of its proper divisors (9951).

22184221 is an equidigital number, since it uses as much as digits as its factorization.

22184221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9950.

The product of its digits is 512, while the sum is 22.

The square root of 22184221 is about 4710.0128449931. The cubic root of 22184221 is about 280.9838729700.

The spelling of 22184221 in words is "twenty-two million, one hundred eighty-four thousand, two hundred twenty-one".