21184222 has 8 divisors (see below), whose sum is σ = 32801472. Its totient is φ = 10250400.

The previous prime is 21184217. The next prime is 21184277. The reversal of 21184222 is 22248112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21184193 and 21184202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170779 + ... + 170902.

It is an arithmetic number, because the mean of its divisors is an integer number (4100184).

Almost surely, 2^21184222 is an apocalyptic number.

21184222 is a deficient number, since it is larger than the sum of its proper divisors (11617250).

21184222 is a wasteful number, since it uses less digits than its factorization.

21184222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341714.

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

The square root of 21184222 is about 4602.6320730643. The cubic root of 21184222 is about 276.6968232156.

The spelling of 21184222 in words is "twenty-one million, one hundred eighty-four thousand, two hundred twenty-two".