21834228 has 48 divisors (see below), whose sum is σ = 55711040. Its totient is φ = 6614784.

The previous prime is 21834203. The next prime is 21834233. The reversal of 21834228 is 82243812.

It is a junction number, because it is equal to n+sod(n) for n = 21834195 and 21834204.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 9408 + ... + 11496.

Almost surely, 2^21834228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21834228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27855520).

21834228 is an abundant number, since it is smaller than the sum of its proper divisors (33876812).

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

21834228 is a wasteful number, since it uses less digits than its factorization.

21834228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176 (or 2174 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 21834228 is about 4672.7109904209. The cubic root of 21834228 is about 279.4983705581.

The spelling of 21834228 in words is "twenty-one million, eight hundred thirty-four thousand, two hundred twenty-eight".