123120221 has 4 divisors (see below), whose sum is σ = 140708832. Its totient is φ = 105531612.

The previous prime is 123120211. The next prime is 123120227. The reversal of 123120221 is 122021321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123120221 - 2¹⁸ = 122858077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123120196 and 123120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123120227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8794295 + ... + 8794308.

It is an arithmetic number, because the mean of its divisors is an integer number (35177208).

Almost surely, 2^123120221 is an apocalyptic number.

It is an amenable number.

123120221 is a deficient number, since it is larger than the sum of its proper divisors (17588611).

123120221 is an equidigital number, since it uses as much as digits as its factorization.

123120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17588610.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 123120221 is about 11095.9551639325. The cubic root of 123120221 is about 497.4809581695.

Adding to 123120221 its reverse (122021321), we get a palindrome (245141542).

The spelling of 123120221 in words is "one hundred twenty-three million, one hundred twenty thousand, two hundred twenty-one".