21850228 has 12 divisors (see below), whose sum is σ = 40250560. Its totient is φ = 10350072.

The previous prime is 21850193. The next prime is 21850259. The reversal of 21850228 is 82205812.

It is a junction number, because it is equal to n+sod(n) for n = 21850196 and 21850205.

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, 143676 + ... + 143827.

Almost surely, 2^21850228 is an apocalyptic number.

It is an amenable number.

21850228 is a deficient number, since it is larger than the sum of its proper divisors (18400332).

21850228 is a wasteful number, since it uses less digits than its factorization.

21850228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287526 (or 287524 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 21850228 is about 4674.4227451098. The cubic root of 21850228 is about 279.5666255021.

The spelling of 21850228 in words is "twenty-one million, eight hundred fifty thousand, two hundred twenty-eight".