21414543 has 8 divisors (see below), whose sum is σ = 30232368. Its totient is φ = 13436544.

The previous prime is 21414529. The next prime is 21414551. The reversal of 21414543 is 34541412.

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

It is not a de Polignac number, because 21414543 - 2¹⁶ = 21349007 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416543) 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, 209896 + ... + 209997.

It is an arithmetic number, because the mean of its divisors is an integer number (3779046).

Almost surely, 2^21414543 is an apocalyptic number.

21414543 is a deficient number, since it is larger than the sum of its proper divisors (8817825).

21414543 is a wasteful number, since it uses less digits than its factorization.

21414543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419913.

The product of its digits is 1920, while the sum is 24.

The square root of 21414543 is about 4627.5850073229. The cubic root of 21414543 is about 277.6959868644.

Adding to 21414543 its reverse (34541412), we get a palindrome (55955955).

The spelling of 21414543 in words is "twenty-one million, four hundred fourteen thousand, five hundred forty-three".