21243232 has 24 divisors (see below), whose sum is σ = 42298200. Its totient is φ = 10500864.

The previous prime is 21243227. The next prime is 21243253. The reversal of 21243232 is 23234212.

It is a congruent number.

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, 882 + ... + 6577.

It is an arithmetic number, because the mean of its divisors is an integer number (1762425).

Almost surely, 2^21243232 is an apocalyptic number.

It is an amenable number.

21243232 is a deficient number, since it is larger than the sum of its proper divisors (21054968).

21243232 is an equidigital number, since it uses as much as digits as its factorization.

21243232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7558 (or 7550 counting only the distinct ones).

The product of its digits is 576, while the sum is 19.

The square root of 21243232 is about 4609.0380775168. The cubic root of 21243232 is about 276.9535039058.

Adding to 21243232 its reverse (23234212), we get a palindrome (44477444).

It can be divided in two parts, 2124 and 3232, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 21243232 in words is "twenty-one million, two hundred forty-three thousand, two hundred thirty-two".