21322532 has 48 divisors (see below), whose sum is σ = 47029248. Its totient is φ = 8217120.

The previous prime is 21322493. The next prime is 21322547. The reversal of 21322532 is 23522312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32633 + ... + 33279.

It is an arithmetic number, because the mean of its divisors is an integer number (979776).

Almost surely, 2^21322532 is an apocalyptic number.

21322532 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 21322532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23514624).

21322532 is an abundant number, since it is smaller than the sum of its proper divisors (25706716).

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

21322532 is a wasteful number, since it uses less digits than its factorization.

21322532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776 (or 774 counting only the distinct ones).

The product of its digits is 720, while the sum is 20.

The square root of 21322532 is about 4617.6327268418. The cubic root of 21322532 is about 277.2976941742.

Adding to 21322532 its reverse (23522312), we get a palindrome (44844844).

It can be divided in two parts, 2132 and 2532, that added together give a palindrome (4664).

The spelling of 21322532 in words is "twenty-one million, three hundred twenty-two thousand, five hundred thirty-two".