21236044 has 6 divisors (see below), whose sum is σ = 37163084. Its totient is φ = 10618020.

The previous prime is 21236041. The next prime is 21236063. The reversal of 21236044 is 44063212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21236041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2654502 + ... + 2654509.

Almost surely, 2^21236044 is an apocalyptic number.

It is an amenable number.

21236044 is a deficient number, since it is larger than the sum of its proper divisors (15927040).

21236044 is a wasteful number, since it uses less digits than its factorization.

21236044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5309015 (or 5309013 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21236044 is about 4608.2582392917. The cubic root of 21236044 is about 276.9222631109.

Adding to 21236044 its reverse (44063212), we get a palindrome (65299256).

The spelling of 21236044 in words is "twenty-one million, two hundred thirty-six thousand, forty-four".