23910221 has 2 divisors, whose sum is σ = 23910222. Its totient is φ = 23910220.

The previous prime is 23910203. The next prime is 23910241. The reversal of 23910221 is 12201932.

It is an a-pointer prime, because the next prime (23910241) can be obtained adding 23910221 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23629321 + 280900 = 4861^2 + 530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23910221 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23910193 and 23910202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23910241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11955110 + 11955111.

It is an arithmetic number, because the mean of its divisors is an integer number (11955111).

Almost surely, 2^23910221 is an apocalyptic number.

It is an amenable number.

23910221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23910221 is an equidigital number, since it uses as much as digits as its factorization.

23910221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 23910221 is about 4889.8078694362. The cubic root of 23910221 is about 288.0897876232.

The spelling of 23910221 in words is "twenty-three million, nine hundred ten thousand, two hundred twenty-one".