21444059 has 16 divisors (see below), whose sum is σ = 26772480. Its totient is φ = 16722720.

The previous prime is 21444043. The next prime is 21444061. The reversal of 21444059 is 95044412.

It is not a de Polignac number, because 21444059 - 2⁴ = 21444043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21444019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4802 + ... + 8120.

It is an arithmetic number, because the mean of its divisors is an integer number (1673280).

Almost surely, 2^21444059 is an apocalyptic number.

21444059 is a deficient number, since it is larger than the sum of its proper divisors (5328421).

21444059 is a wasteful number, since it uses less digits than its factorization.

21444059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21444059 is about 4630.7730456156. The cubic root of 21444059 is about 277.8235125348.

It can be divided in two parts, 21 and 444059, that multiplied together give a palindrome (9325239).

The spelling of 21444059 in words is "twenty-one million, four hundred forty-four thousand, fifty-nine".