21814044 has 24 divisors (see below), whose sum is σ = 58171008. Its totient is φ = 6232560.

The previous prime is 21814021. The next prime is 21814069. The reversal of 21814044 is 44041812.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 129762 + ... + 129929.

It is an arithmetic number, because the mean of its divisors is an integer number (2423792).

Almost surely, 2^21814044 is an apocalyptic number.

It is an amenable number.

21814044 is an abundant number, since it is smaller than the sum of its proper divisors (36356964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21814044 is a wasteful number, since it uses less digits than its factorization.

21814044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259705 (or 259703 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 21814044 is about 4670.5507169926. The cubic root of 21814044 is about 279.4122193655.

Adding to 21814044 its reverse (44041812), we get a palindrome (65855856).

The spelling of 21814044 in words is "twenty-one million, eight hundred fourteen thousand, forty-four".