21401443 has 8 divisors (see below), whose sum is σ = 24697088. Its totient is φ = 18165384.

The previous prime is 21401441. The next prime is 21401447. The reversal of 21401443 is 34410412.

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 21401443 - 2¹ = 21401441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21401443.

It is not an unprimeable number, because it can be changed into a prime (21401441) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14121 + ... + 15562.

It is an arithmetic number, because the mean of its divisors is an integer number (3087136).

Almost surely, 2^21401443 is an apocalyptic number.

21401443 is a deficient number, since it is larger than the sum of its proper divisors (3295645).

21401443 is a wasteful number, since it uses less digits than its factorization.

21401443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29793.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21401443 is about 4626.1693656847. The cubic root of 21401443 is about 277.6393499725.

Adding to 21401443 its reverse (34410412), we get a palindrome (55811855).

The spelling of 21401443 in words is "twenty-one million, four hundred one thousand, four hundred forty-three".