12122212321 has 8 divisors (see below), whose sum is σ = 12837398184. Its totient is φ = 11407261440.

The previous prime is 12122212301. The next prime is 12122212327. The reversal of 12122212321 is 12321222121.

It can be written as a sum of positive squares in 4 ways, for example, as 3517794721 + 8604417600 = 59311^2 + 92760^2 .

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-12122212321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12122212327) 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, 53631 + ... + 164683.

It is an arithmetic number, because the mean of its divisors is an integer number (1604674773).

Almost surely, 2^12122212321 is an apocalyptic number.

It is an amenable number.

12122212321 is a deficient number, since it is larger than the sum of its proper divisors (715185863).

12122212321 is a wasteful number, since it uses less digits than its factorization.

12122212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117491.

The product of its digits is 192, while the sum is 19.

Adding to 12122212321 its reverse (12321222121), we get a palindrome (24443434442).

The spelling of 12122212321 in words is "twelve billion, one hundred twenty-two million, two hundred twelve thousand, three hundred twenty-one".