21411244 has 12 divisors (see below), whose sum is σ = 38084368. Its totient is φ = 10530000.

The previous prime is 21411241. The next prime is 21411253. The reversal of 21411244 is 44211412.

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

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (21411241) 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, 43632 + ... + 44119.

Almost surely, 2^21411244 is an apocalyptic number.

It is an amenable number.

21411244 is a deficient number, since it is larger than the sum of its proper divisors (16673124).

21411244 is a wasteful number, since it uses less digits than its factorization.

21411244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87816 (or 87814 counting only the distinct ones).

The product of its digits is 256, while the sum is 19.

The square root of 21411244 is about 4627.2285441720. The cubic root of 21411244 is about 277.6817260557.

Adding to 21411244 its reverse (44211412), we get a palindrome (65622656).

The spelling of 21411244 in words is "twenty-one million, four hundred eleven thousand, two hundred forty-four".