23218427 has 2 divisors, whose sum is σ = 23218428. Its totient is φ = 23218426.

The previous prime is 23218397. The next prime is 23218439. The reversal of 23218427 is 72481232.

23218427 is nontrivially palindromic in base 15.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23218427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23218427.

It is not a weakly prime, because it can be changed into another prime (23218457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11609213 + 11609214.

It is an arithmetic number, because the mean of its divisors is an integer number (11609214).

Almost surely, 2^23218427 is an apocalyptic number.

23218427 is a deficient number, since it is larger than the sum of its proper divisors (1).

23218427 is an equidigital number, since it uses as much as digits as its factorization.

23218427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 29.

The square root of 23218427 is about 4818.5503006610. The cubic root of 23218427 is about 285.2841200692.

Adding to 23218427 its reverse (72481232), we get a palindrome (95699659).

The spelling of 23218427 in words is "twenty-three million, two hundred eighteen thousand, four hundred twenty-seven".