21483828 has 54 divisors (see below), whose sum is σ = 56216706. Its totient is φ = 6912864.

The previous prime is 21483823. The next prime is 21483829. The reversal of 21483828 is 82838412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20903184 + 580644 = 4572^2 + 762^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21483792 and 21483801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21483823) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 169101 + ... + 169227.

Almost surely, 2^21483828 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 21483828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28108353).

21483828 is an abundant number, since it is smaller than the sum of its proper divisors (34732878).

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

21483828 is a wasteful number, since it uses less digits than its factorization.

21483828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 169 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 21483828 is about 4635.0650480872. The cubic root of 21483828 is about 277.9951519952.

The spelling of 21483828 in words is "twenty-one million, four hundred eighty-three thousand, eight hundred twenty-eight".