21241841 has 4 divisors (see below), whose sum is σ = 21394800. Its totient is φ = 21088884.

The previous prime is 21241837. The next prime is 21241849. The reversal of 21241841 is 14814212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21241841 - 2² = 21241837 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21241849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76271 + ... + 76548.

It is an arithmetic number, because the mean of its divisors is an integer number (5348700).

Almost surely, 2^21241841 is an apocalyptic number.

It is an amenable number.

21241841 is a deficient number, since it is larger than the sum of its proper divisors (152959).

21241841 is a wasteful number, since it uses less digits than its factorization.

21241841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152958.

The product of its digits is 512, while the sum is 23.

The square root of 21241841 is about 4608.8871758810. The cubic root of 21241841 is about 276.9474588318.

The spelling of 21241841 in words is "twenty-one million, two hundred forty-one thousand, eight hundred forty-one".