21032432 has 10 divisors (see below), whose sum is σ = 40750368. Its totient is φ = 10516208.

The previous prime is 21032399. The next prime is 21032437. The reversal of 21032432 is 23423012.

It is a self number, because there is not a number n which added to its sum of digits gives 21032432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657248 + ... + 657279.

Almost surely, 2^21032432 is an apocalyptic number.

It is an amenable number.

21032432 is a deficient number, since it is larger than the sum of its proper divisors (19717936).

21032432 is a wasteful number, since it uses less digits than its factorization.

21032432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314535 (or 1314529 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21032432 is about 4586.1129510731. The cubic root of 21032432 is about 276.0343722507.

Adding to 21032432 its reverse (23423012), we get a palindrome (44455444).

The spelling of 21032432 in words is "twenty-one million, thirty-two thousand, four hundred thirty-two".