21043032 has 32 divisors (see below), whose sum is σ = 55377600. Its totient is φ = 6645024.

The previous prime is 21043027. The next prime is 21043037. The reversal of 21043032 is 23034012.

It is an interprime number because it is at equal distance from previous prime (21043027) and next prime (21043037).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22618 + ... + 23529.

It is an arithmetic number, because the mean of its divisors is an integer number (1730550).

Almost surely, 2^21043032 is an apocalyptic number.

It is an amenable number.

21043032 is an abundant number, since it is smaller than the sum of its proper divisors (34334568).

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

21043032 is a wasteful number, since it uses less digits than its factorization.

21043032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46175 (or 46171 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21043032 is about 4587.2684682717. The cubic root of 21043032 is about 276.0807367247.

Adding to 21043032 its reverse (23034012), we get a palindrome (44077044).

The spelling of 21043032 in words is "twenty-one million, forty-three thousand, thirty-two".