21414223 has 2 divisors, whose sum is σ = 21414224. Its totient is φ = 21414222.

The previous prime is 21414221. The next prime is 21414229. The reversal of 21414223 is 32241412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21414223 - 2¹ = 21414221 is a prime.

Together with 21414221, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21414223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21414221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707111 + 10707112.

It is an arithmetic number, because the mean of its divisors is an integer number (10707112).

Almost surely, 2^21414223 is an apocalyptic number.

21414223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21414223 is an equidigital number, since it uses as much as digits as its factorization.

21414223 is an evil number, because the sum of its binary digits is even.

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

The square root of 21414223 is about 4627.5504319240. The cubic root of 21414223 is about 277.6946036431.

Adding to 21414223 its reverse (32241412), we get a palindrome (53655635).

The spelling of 21414223 in words is "twenty-one million, four hundred fourteen thousand, two hundred twenty-three".