21183282 has 64 divisors (see below), whose sum is σ = 49593600. Its totient is φ = 6776784.

The previous prime is 21183269. The next prime is 21183313. The reversal of 21183282 is 28238112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126763 + ... + 126929.

It is an arithmetic number, because the mean of its divisors is an integer number (774900).

Almost surely, 2^21183282 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21183282, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24796800).

21183282 is an abundant number, since it is smaller than the sum of its proper divisors (28410318).

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

21183282 is an equidigital number, since it uses as much as digits as its factorization.

21183282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 201 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 21183282 is about 4602.5299564479. The cubic root of 21183282 is about 276.6927305650.

The spelling of 21183282 in words is "twenty-one million, one hundred eighty-three thousand, two hundred eighty-two".