21224146 has 8 divisors (see below), whose sum is σ = 31996800. Its totient is φ = 10558548.

The previous prime is 21224141. The next prime is 21224149. The reversal of 21224146 is 64142212.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21224141) 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 3 ways as a sum of consecutive naturals, for example, 26266 + ... + 27061.

It is an arithmetic number, because the mean of its divisors is an integer number (3999600).

Almost surely, 2^21224146 is an apocalyptic number.

21224146 is a deficient number, since it is larger than the sum of its proper divisors (10772654).

21224146 is a wasteful number, since it uses less digits than its factorization.

21224146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53528.

The product of its digits is 768, while the sum is 22.

The square root of 21224146 is about 4606.9671151420. The cubic root of 21224146 is about 276.8705360157.

Adding to 21224146 its reverse (64142212), we get a palindrome (85366358).

The spelling of 21224146 in words is "twenty-one million, two hundred twenty-four thousand, one hundred forty-six".