12121142221 has 8 divisors (see below), whose sum is σ = 12494736000. Its totient is φ = 11752369248.

The previous prime is 12121142219. The next prime is 12121142227. The reversal of 12121142221 is 12224112121.

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 12121142221 - 2¹ = 12121142219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121142227) 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, 1200096 + ... + 1210153.

It is an arithmetic number, because the mean of its divisors is an integer number (1561842000).

Almost surely, 2^12121142221 is an apocalyptic number.

It is an amenable number.

12121142221 is a deficient number, since it is larger than the sum of its proper divisors (373593779).

12121142221 is a wasteful number, since it uses less digits than its factorization.

12121142221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410403.

The product of its digits is 128, while the sum is 19.

Adding to 12121142221 its reverse (12224112121), we get a palindrome (24345254342).

The spelling of 12121142221 in words is "twelve billion, one hundred twenty-one million, one hundred forty-two thousand, two hundred twenty-one".