21432841 has 8 divisors (see below), whose sum is σ = 22002624. Its totient is φ = 20870640.

The previous prime is 21432833. The next prime is 21432881. The reversal of 21432841 is 14823412.

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

It is a cyclic number.

It is not a de Polignac number, because 21432841 - 2³ = 21432833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21432821) 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, 4075 + ... + 7711.

It is an arithmetic number, because the mean of its divisors is an integer number (2750328).

Almost surely, 2^21432841 is an apocalyptic number.

It is an amenable number.

21432841 is a deficient number, since it is larger than the sum of its proper divisors (569783).

21432841 is an equidigital number, since it uses as much as digits as its factorization.

21432841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3791.

The product of its digits is 1536, while the sum is 25.

The square root of 21432841 is about 4629.5616423156. The cubic root of 21432841 is about 277.7750582786.

It can be divided in two parts, 214328 and 41, that added together give a square (214369 = 463²).

The spelling of 21432841 in words is "twenty-one million, four hundred thirty-two thousand, eight hundred forty-one".