21814123 has 2 divisors, whose sum is σ = 21814124. Its totient is φ = 21814122.

The previous prime is 21814087. The next prime is 21814141. The reversal of 21814123 is 32141812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21814123 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 21814094 and 21814103.

It is not a weakly prime, because it can be changed into another prime (21814153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10907061 + 10907062.

It is an arithmetic number, because the mean of its divisors is an integer number (10907062).

Almost surely, 2^21814123 is an apocalyptic number.

21814123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21814123 is an equidigital number, since it uses as much as digits as its factorization.

21814123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 22.

The square root of 21814123 is about 4670.5591742317. The cubic root of 21814123 is about 279.4125566641.

Adding to 21814123 its reverse (32141812), we get a palindrome (53955935).

It can be divided in two parts, 218 and 14123, that added together give a palindrome (14341).

The spelling of 21814123 in words is "twenty-one million, eight hundred fourteen thousand, one hundred twenty-three".