21814143 has 32 divisors (see below), whose sum is σ = 33191424. Its totient is φ = 12642432.

The previous prime is 21814141. The next prime is 21814151. The reversal of 21814143 is 34141812.

It is not a de Polignac number, because 21814143 - 2¹ = 21814141 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 (21814141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74305 + ... + 74597.

It is an arithmetic number, because the mean of its divisors is an integer number (1037232).

Almost surely, 2^21814143 is an apocalyptic number.

21814143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21814143 is a deficient number, since it is larger than the sum of its proper divisors (11377281).

21814143 is a wasteful number, since it uses less digits than its factorization.

21814143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415.

The product of its digits is 768, while the sum is 24.

The square root of 21814143 is about 4670.5613153025. The cubic root of 21814143 is about 279.4126420560.

Adding to 21814143 its reverse (34141812), we get a palindrome (55955955).

The spelling of 21814143 in words is "twenty-one million, eight hundred fourteen thousand, one hundred forty-three".