23180221 has 2 divisors, whose sum is σ = 23180222. Its totient is φ = 23180220.

The previous prime is 23180203. The next prime is 23180233. The reversal of 23180221 is 12208132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 5625 = 4814^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 23180221 - 2⁵ = 23180189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23180291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11590110 + 11590111.

It is an arithmetic number, because the mean of its divisors is an integer number (11590111).

Almost surely, 2^23180221 is an apocalyptic number.

It is an amenable number.

23180221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23180221 is an equidigital number, since it uses as much as digits as its factorization.

23180221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 23180221 is about 4814.5841980383. The cubic root of 23180221 is about 285.1275555011.

Adding to 23180221 its reverse (12208132), we get a palindrome (35388353).

The spelling of 23180221 in words is "twenty-three million, one hundred eighty thousand, two hundred twenty-one".