423120221 has 2 divisors, whose sum is σ = 423120222. Its totient is φ = 423120220.

The previous prime is 423120163. The next prime is 423120281. The reversal of 423120221 is 122021324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392594596 + 30525625 = 19814^2 + 5525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423120221 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 423120221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423120281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211560110 + 211560111.

It is an arithmetic number, because the mean of its divisors is an integer number (211560111).

Almost surely, 2^423120221 is an apocalyptic number.

It is an amenable number.

423120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

423120221 is an equidigital number, since it uses as much as digits as its factorization.

423120221 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 17.

The square root of 423120221 is about 20569.8862660930. The cubic root of 423120221 is about 750.7371839165.

Adding to 423120221 its reverse (122021324), we get a palindrome (545141545).

The spelling of 423120221 in words is "four hundred twenty-three million, one hundred twenty thousand, two hundred twenty-one".