21224850 has 24 divisors (see below), whose sum is σ = 52638000. Its totient is φ = 5659920.

The previous prime is 21224849. The next prime is 21224867. The reversal of 21224850 is 5842212.

It is a self number, because there is not a number n which added to its sum of digits gives 21224850.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 70600 + ... + 70899.

It is an arithmetic number, because the mean of its divisors is an integer number (2193250).

Almost surely, 2^21224850 is an apocalyptic number.

21224850 is an abundant number, since it is smaller than the sum of its proper divisors (31413150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21224850 is a wasteful number, since it uses less digits than its factorization.

21224850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141514 (or 141509 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 21224850 is about 4607.0435205238. The cubic root of 21224850 is about 276.8735972257.

The spelling of 21224850 in words is "twenty-one million, two hundred twenty-four thousand, eight hundred fifty".