23430221 has 2 divisors, whose sum is σ = 23430222. Its totient is φ = 23430220.

The previous prime is 23430191. The next prime is 23430223. The reversal of 23430221 is 12203432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14364100 + 9066121 = 3790^2 + 3011^2 .

It is a cyclic number.

It is not a de Polignac number, because 23430221 - 2⁶ = 23430157 is a prime.

It is a super-2 number, since 2×23430221² = 1097950512217682, which contains 22 as substring.

Together with 23430223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23430221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23430223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11715110 + 11715111.

It is an arithmetic number, because the mean of its divisors is an integer number (11715111).

Almost surely, 2^23430221 is an apocalyptic number.

It is an amenable number.

23430221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23430221 is an equidigital number, since it uses as much as digits as its factorization.

23430221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 23430221 is about 4840.4773524932. The cubic root of 23430221 is about 286.1489313487.

Adding to 23430221 its reverse (12203432), we get a palindrome (35633653).

The spelling of 23430221 in words is "twenty-three million, four hundred thirty thousand, two hundred twenty-one".