21798832 has 40 divisors (see below), whose sum is σ = 46372032. Its totient is φ = 9844800.

The previous prime is 21798827. The next prime is 21798841. The reversal of 21798832 is 23889712.

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 7 ways as a sum of consecutive naturals, for example, 36843 + ... + 37429.

Almost surely, 2^21798832 is an apocalyptic number.

21798832 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21798832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23186016).

21798832 is an abundant number, since it is smaller than the sum of its proper divisors (24573200).

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

21798832 is a wasteful number, since it uses less digits than its factorization.

21798832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817 (or 811 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 21798832 is about 4668.9219312385. The cubic root of 21798832 is about 279.3472549925.

It can be divided in two parts, 2179 and 8832, that added together give a palindrome (11011).

The spelling of 21798832 in words is "twenty-one million, seven hundred ninety-eight thousand, eight hundred thirty-two".