21444107 has 8 divisors (see below), whose sum is σ = 22029840. Its totient is φ = 20861440.

The previous prime is 21444097. The next prime is 21444109. The reversal of 21444107 is 70144412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21444107 - 2⁴ = 21444091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22619 + ... + 23547.

It is an arithmetic number, because the mean of its divisors is an integer number (2753730).

Almost surely, 2^21444107 is an apocalyptic number.

21444107 is a deficient number, since it is larger than the sum of its proper divisors (585733).

21444107 is an equidigital number, since it uses as much as digits as its factorization.

21444107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 21444107 is about 4630.7782283327. The cubic root of 21444107 is about 277.8237198263.

Adding to 21444107 its reverse (70144412), we get a palindrome (91588519).

The spelling of 21444107 in words is "twenty-one million, four hundred forty-four thousand, one hundred seven".