21241744 has 30 divisors (see below), whose sum is σ = 42120134. Its totient is φ = 10377600.

The previous prime is 21241729. The next prime is 21241763. The reversal of 21241744 is 44714212.

It can be written as a sum of positive squares in only one way, i.e., 20358144 + 883600 = 4512^2 + 940^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35044 + ... + 35644.

Almost surely, 2^21241744 is an apocalyptic number.

It is an amenable number.

21241744 is a deficient number, since it is larger than the sum of its proper divisors (20878390).

21241744 is an equidigital number, since it uses as much as digits as its factorization.

21241744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703 (or 650 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The square root of 21241744 is about 4608.8766527214. The cubic root of 21241744 is about 276.9470372747.

Adding to 21241744 its reverse (44714212), we get a palindrome (65955956).

The spelling of 21241744 in words is "twenty-one million, two hundred forty-one thousand, seven hundred forty-four".