21214443 has 8 divisors (see below), whose sum is σ = 28473856. Its totient is φ = 14049000.

The previous prime is 21214433. The next prime is 21214451. The reversal of 21214443 is 34441212.

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

It is not a de Polignac number, because 21214443 - 2⁸ = 21214187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214433) 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, 22963 + ... + 23868.

It is an arithmetic number, because the mean of its divisors is an integer number (3559232).

Almost surely, 2^21214443 is an apocalyptic number.

21214443 is a deficient number, since it is larger than the sum of its proper divisors (7259413).

21214443 is a wasteful number, since it uses less digits than its factorization.

21214443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46985.

The product of its digits is 768, while the sum is 21.

The square root of 21214443 is about 4605.9139158260. The cubic root of 21214443 is about 276.8283374697.

Adding to 21214443 its reverse (34441212), we get a palindrome (55655655).

The spelling of 21214443 in words is "twenty-one million, two hundred fourteen thousand, four hundred forty-three".