21414443 has 4 divisors (see below), whose sum is σ = 21428760. Its totient is φ = 21400128.

The previous prime is 21414431. The next prime is 21414457. The reversal of 21414443 is 34441412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21414443 - 2⁴ = 21414427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21414413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4613 + ... + 8006.

It is an arithmetic number, because the mean of its divisors is an integer number (5357190).

Almost surely, 2^21414443 is an apocalyptic number.

21414443 is a deficient number, since it is larger than the sum of its proper divisors (14317).

21414443 is a wasteful number, since it uses less digits than its factorization.

21414443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14316.

The product of its digits is 1536, while the sum is 23.

The square root of 21414443 is about 4627.5742025385. The cubic root of 21414443 is about 277.6955546092.

Adding to 21414443 its reverse (34441412), we get a palindrome (55855855).

The spelling of 21414443 in words is "twenty-one million, four hundred fourteen thousand, four hundred forty-three".