21814043 has 4 divisors (see below), whose sum is σ = 23097240. Its totient is φ = 20530848.

The previous prime is 21814021. The next prime is 21814069. The reversal of 21814043 is 34041812.

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 21814043 - 2¹⁰ = 21813019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21814073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641573 + ... + 641606.

It is an arithmetic number, because the mean of its divisors is an integer number (5774310).

Almost surely, 2^21814043 is an apocalyptic number.

21814043 is a deficient number, since it is larger than the sum of its proper divisors (1283197).

21814043 is a wasteful number, since it uses less digits than its factorization.

21814043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283196.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21814043 is about 4670.5506099388. The cubic root of 21814043 is about 279.4122150959.

Adding to 21814043 its reverse (34041812), we get a palindrome (55855855).

The spelling of 21814043 in words is "twenty-one million, eight hundred fourteen thousand, forty-three".