21444038 has 32 divisors (see below), whose sum is σ = 42467328. Its totient is φ = 7862400.

The previous prime is 21444023. The next prime is 21444043. The reversal of 21444038 is 83044412.

It is a junction number, because it is equal to n+sod(n) for n = 21443998 and 21444016.

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 15 ways as a sum of consecutive naturals, for example, 1478 + ... + 6713.

It is an arithmetic number, because the mean of its divisors is an integer number (1327104).

Almost surely, 2^21444038 is an apocalyptic number.

21444038 is a deficient number, since it is larger than the sum of its proper divisors (21023290).

21444038 is a wasteful number, since it uses less digits than its factorization.

21444038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8228.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 21444038 is about 4630.7707781751. The cubic root of 21444038 is about 277.8234218446.

The spelling of 21444038 in words is "twenty-one million, four hundred forty-four thousand, thirty-eight".