21432441 has 8 divisors (see below), whose sum is σ = 28871584. Its totient is φ = 14140800.

The previous prime is 21432413. The next prime is 21432443. The reversal of 21432441 is 14423412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21432441 - 2⁵ = 21432409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21432443) by changing a digit.

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, 36535 + ... + 37116.

It is an arithmetic number, because the mean of its divisors is an integer number (3608948).

Almost surely, 2^21432441 is an apocalyptic number.

It is an amenable number.

21432441 is a deficient number, since it is larger than the sum of its proper divisors (7439143).

21432441 is an equidigital number, since it uses as much as digits as its factorization.

21432441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73751.

The product of its digits is 768, while the sum is 21.

The square root of 21432441 is about 4629.5184414796. The cubic root of 21432441 is about 277.7733302340.

Adding to 21432441 its reverse (14423412), we get a palindrome (35855853).

The spelling of 21432441 in words is "twenty-one million, four hundred thirty-two thousand, four hundred forty-one".