21150224 has 20 divisors (see below), whose sum is σ = 41050944. Its totient is φ = 10556448.

The previous prime is 21150223. The next prime is 21150229. The reversal of 21150224 is 42205112.

It is not an unprimeable number, because it can be changed into a prime (21150223) 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, 14789 + ... + 16155.

Almost surely, 2^21150224 is an apocalyptic number.

It is an amenable number.

21150224 is a deficient number, since it is larger than the sum of its proper divisors (19900720).

21150224 is a wasteful number, since it uses less digits than its factorization.

21150224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2342 (or 2336 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21150224 is about 4598.9372685437. The cubic root of 21150224 is about 276.5487228116.

Adding to 21150224 its reverse (42205112), we get a palindrome (63355336).

The spelling of 21150224 in words is "twenty-one million, one hundred fifty thousand, two hundred twenty-four".