21132352 has 28 divisors (see below), whose sum is σ = 42629836. Its totient is φ = 10391040.

The previous prime is 21132341. The next prime is 21132383. The reversal of 21132352 is 25323112.

It can be written as a sum of positive squares in 2 ways, for example, as 2262016 + 18870336 = 1504^2 + 4344^2 .

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, 1198 + ... + 6610.

Almost surely, 2^21132352 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 21132352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21314918).

21132352 is an abundant number, since it is smaller than the sum of its proper divisors (21497484).

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

21132352 is an equidigital number, since it uses as much as digits as its factorization.

21132352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5486 (or 5476 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 21132352 is about 4596.9938003004. The cubic root of 21132352 is about 276.4708060393.

Adding to 21132352 its reverse (25323112), we get a palindrome (46455464).

It can be divided in two parts, 2113 and 2352, that added together give a triangular number (4465 = T₉₄).

The spelling of 21132352 in words is "twenty-one million, one hundred thirty-two thousand, three hundred fifty-two".