21363232 has 48 divisors (see below), whose sum is σ = 46321632. Its totient is φ = 9617920.

The previous prime is 21363193. The next prime is 21363253. The reversal of 21363232 is 23236312.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 7 ways as a sum of consecutive naturals, for example, 48003 + ... + 48445.

It is an arithmetic number, because the mean of its divisors is an integer number (965034).

Almost surely, 2^21363232 is an apocalyptic number.

21363232 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 21363232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23160816).

21363232 is an abundant number, since it is smaller than the sum of its proper divisors (24958400).

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

21363232 is a wasteful number, since it uses less digits than its factorization.

21363232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 593 counting only the distinct ones).

The product of its digits is 1296, while the sum is 22.

The square root of 21363232 is about 4622.0376458874. The cubic root of 21363232 is about 277.4740153685.

Adding to 21363232 its reverse (23236312), we get a palindrome (44599544).

Subtracting 21363232 from its reverse (23236312), we obtain a triangular number (1873080 = T₁₉₃₅).

The spelling of 21363232 in words is "twenty-one million, three hundred sixty-three thousand, two hundred thirty-two".