12121242321 has 8 divisors (see below), whose sum is σ = 16162632640. Its totient is φ = 8080340112.

The previous prime is 12121242283. The next prime is 12121242349. The reversal of 12121242321 is 12324212121.

It is a happy number.

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

It is not a de Polignac number, because 12121242321 - 2⁷ = 12121242193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121242361) 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, 59506 + ... + 166683.

It is an arithmetic number, because the mean of its divisors is an integer number (2020329080).

Almost surely, 2^12121242321 is an apocalyptic number.

It is an amenable number.

12121242321 is a deficient number, since it is larger than the sum of its proper divisors (4041390319).

12121242321 is a wasteful number, since it uses less digits than its factorization.

12121242321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244055.

The product of its digits is 384, while the sum is 21.

Adding to 12121242321 its reverse (12324212121), we get a palindrome (24445454442).

The spelling of 12121242321 in words is "twelve billion, one hundred twenty-one million, two hundred forty-two thousand, three hundred twenty-one".