123112221 has 8 divisors (see below), whose sum is σ = 169810080. Its totient is φ = 79244592.

The previous prime is 123112211. The next prime is 123112247. The reversal of 123112221 is 122211321.

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

It is not a de Polignac number, because 123112221 - 2⁵ = 123112189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123112201) 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, 707455 + ... + 707628.

It is an arithmetic number, because the mean of its divisors is an integer number (21226260).

Almost surely, 2^123112221 is an apocalyptic number.

It is an amenable number.

123112221 is a deficient number, since it is larger than the sum of its proper divisors (46697859).

123112221 is a wasteful number, since it uses less digits than its factorization.

123112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415115.

The product of its digits is 48, while the sum is 15.

The square root of 123112221 is about 11095.5946663529. The cubic root of 123112221 is about 497.4701829726.

Adding to 123112221 its reverse (122211321), we get a palindrome (245323542).

It can be divided in two parts, 1231 and 12221, that multiplied together give a palindrome (15044051).

The spelling of 123112221 in words is "one hundred twenty-three million, one hundred twelve thousand, two hundred twenty-one".