12222220121 has 8 divisors (see below), whose sum is σ = 12259320840. Its totient is φ = 12185149312.

The previous prime is 12222220097. The next prime is 12222220123. The reversal of 12222220121 is 12102222221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 802305625 + 11419914496 = 28325^2 + 106864^2 .

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 12222220121 - 2¹⁸ = 12221957977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12222220121.

It is not an unprimeable number, because it can be changed into a prime (12222220123) 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, 1018271 + ... + 1030203.

It is an arithmetic number, because the mean of its divisors is an integer number (1532415105).

Almost surely, 2^12222220121 is an apocalyptic number.

It is an amenable number.

12222220121 is a deficient number, since it is larger than the sum of its proper divisors (37100719).

12222220121 is a wasteful number, since it uses less digits than its factorization.

12222220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14955.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12222220121 its reverse (12102222221), we get a palindrome (24324442342).

The spelling of 12222220121 in words is "twelve billion, two hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".