21224590 has 8 divisors (see below), whose sum is σ = 38204280. Its totient is φ = 8489832.

The previous prime is 21224579. The next prime is 21224591. The reversal of 21224590 is 9542212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224591) 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, 1061220 + ... + 1061239.

It is an arithmetic number, because the mean of its divisors is an integer number (4775535).

Almost surely, 2^21224590 is an apocalyptic number.

21224590 is a deficient number, since it is larger than the sum of its proper divisors (16979690).

21224590 is a wasteful number, since it uses less digits than its factorization.

21224590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122466.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21224590 is about 4607.0153027747. The cubic root of 21224590 is about 276.8724666730.

The spelling of 21224590 in words is "twenty-one million, two hundred twenty-four thousand, five hundred ninety".