21241244 has 6 divisors (see below), whose sum is σ = 37172184. Its totient is φ = 10620620.

The previous prime is 21241229. The next prime is 21241247. The reversal of 21241244 is 44214212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241247) 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 as a sum of consecutive naturals, namely, 2655152 + ... + 2655159.

It is an arithmetic number, because the mean of its divisors is an integer number (6195364).

Almost surely, 2^21241244 is an apocalyptic number.

It is an amenable number.

21241244 is a deficient number, since it is larger than the sum of its proper divisors (15930940).

21241244 is a wasteful number, since it uses less digits than its factorization.

21241244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5310315 (or 5310313 counting only the distinct ones).

The product of its digits is 512, while the sum is 20.

The square root of 21241244 is about 4608.8224092495. The cubic root of 21241244 is about 276.9448642798.

Adding to 21241244 its reverse (44214212), we get a palindrome (65455456).

The spelling of 21241244 in words is "twenty-one million, two hundred forty-one thousand, two hundred forty-four".