21852228 has 12 divisors (see below), whose sum is σ = 50988560. Its totient is φ = 7284072.

The previous prime is 21852203. The next prime is 21852239. The reversal of 21852228 is 82225812.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21852195 and 21852204.

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, 910498 + ... + 910521.

Almost surely, 2^21852228 is an apocalyptic number.

It is an amenable number.

21852228 is an abundant number, since it is smaller than the sum of its proper divisors (29136332).

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

21852228 is a wasteful number, since it uses less digits than its factorization.

21852228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821026 (or 1821024 counting only the distinct ones).

The product of its digits is 5120, while the sum is 30.

The square root of 21852228 is about 4674.6366703734. The cubic root of 21852228 is about 279.5751550270.

The spelling of 21852228 in words is "twenty-one million, eight hundred fifty-two thousand, two hundred twenty-eight".