21936044 has 12 divisors (see below), whose sum is σ = 41341104. Its totient is φ = 10124304.

The previous prime is 21936037. The next prime is 21936059. The reversal of 21936044 is 44063912.

It is a junction number, because it is equal to n+sod(n) for n = 21935998 and 21936016.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210872 + ... + 210975.

It is an arithmetic number, because the mean of its divisors is an integer number (3445092).

Almost surely, 2^21936044 is an apocalyptic number.

It is an amenable number.

21936044 is a deficient number, since it is larger than the sum of its proper divisors (19405060).

21936044 is a wasteful number, since it uses less digits than its factorization.

21936044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421864 (or 421862 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 21936044 is about 4683.5930651584. The cubic root of 21936044 is about 279.9321434206.

Adding to 21936044 its reverse (44063912), we get a palindrome (65999956).

It can be divided in two parts, 219 and 36044, that added together give a palindrome (36263).

The spelling of 21936044 in words is "twenty-one million, nine hundred thirty-six thousand, forty-four".