123320221 has 2 divisors, whose sum is σ = 123320222. Its totient is φ = 123320220.

The previous prime is 123320213. The next prime is 123320231. The reversal of 123320221 is 122023321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102799321 + 20520900 = 10139^2 + 4530^2 .

It is a cyclic number.

It is not a de Polignac number, because 123320221 - 2³ = 123320213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123320195 and 123320204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123320231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61660110 + 61660111.

It is an arithmetic number, because the mean of its divisors is an integer number (61660111).

Almost surely, 2^123320221 is an apocalyptic number.

It is an amenable number.

123320221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123320221 is an equidigital number, since it uses as much as digits as its factorization.

123320221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 123320221 is about 11104.9638000310. The cubic root of 123320221 is about 497.7501865291.

Adding to 123320221 its reverse (122023321), we get a palindrome (245343542).

It can be divided in two parts, 12 and 3320221, that added together give a palindrome (3320233).

The spelling of 123320221 in words is "one hundred twenty-three million, three hundred twenty thousand, two hundred twenty-one".