12123331221 has 8 divisors (see below), whose sum is σ = 16307490240. Its totient is φ = 8010696512.

The previous prime is 12123331217. The next prime is 12123331223. The reversal of 12123331221 is 12213332121.

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

It is a cyclic number.

It is not a de Polignac number, because 12123331221 - 2² = 12123331217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123331223) 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, 17880681 + ... + 17881358.

It is an arithmetic number, because the mean of its divisors is an integer number (2038436280).

Almost surely, 2^12123331221 is an apocalyptic number.

It is an amenable number.

12123331221 is a deficient number, since it is larger than the sum of its proper divisors (4184159019).

12123331221 is a wasteful number, since it uses less digits than its factorization.

12123331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35762155.

The product of its digits is 432, while the sum is 21.

Adding to 12123331221 its reverse (12213332121), we get a palindrome (24336663342).

The spelling of 12123331221 in words is "twelve billion, one hundred twenty-three million, three hundred thirty-one thousand, two hundred twenty-one".