123123221 has 8 divisors (see below), whose sum is σ = 135416064. Its totient is φ = 111233520.

The previous prime is 123123151. The next prime is 123123229. The reversal of 123123221 is 122321321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123123221 is a prime.

It is a Duffinian number.

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 123123221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123123229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100145 + ... + 101366.

It is an arithmetic number, because the mean of its divisors is an integer number (16927008).

Almost surely, 2^123123221 is an apocalyptic number.

It is an amenable number.

123123221 is a deficient number, since it is larger than the sum of its proper divisors (12292843).

123123221 is a wasteful number, since it uses less digits than its factorization.

123123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201571.

The product of its digits is 144, while the sum is 17.

The square root of 123123221 is about 11096.0903475053. The cubic root of 123123221 is about 497.4849987480.

Adding to 123123221 its reverse (122321321), we get a palindrome (245444542).

The spelling of 123123221 in words is "one hundred twenty-three million, one hundred twenty-three thousand, two hundred twenty-one".