21432041 has 4 divisors (see below), whose sum is σ = 21454212. Its totient is φ = 21409872.

The previous prime is 21432023. The next prime is 21432077. The reversal of 21432041 is 14023412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 235225 + 21196816 = 485^2 + 4604^2 .

It is a cyclic number.

It is not a de Polignac number, because 21432041 - 2¹⁰ = 21431017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21432091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9566 + ... + 11591.

It is an arithmetic number, because the mean of its divisors is an integer number (5363553).

Almost surely, 2^21432041 is an apocalyptic number.

It is an amenable number.

21432041 is a deficient number, since it is larger than the sum of its proper divisors (22171).

21432041 is a wasteful number, since it uses less digits than its factorization.

21432041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22170.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21432041 is about 4629.4752402405. The cubic root of 21432041 is about 277.7716021679.

Adding to 21432041 its reverse (14023412), we get a palindrome (35455453).

The spelling of 21432041 in words is "twenty-one million, four hundred thirty-two thousand, forty-one".