12222222121 has 8 divisors (see below), whose sum is σ = 12293518400. Its totient is φ = 12151082160.

The previous prime is 12222222119. The next prime is 12222222191. The reversal of 12222222121 is 12122222221.

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 12222222121 - 2¹ = 12222222119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12222222101) 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, 119620 + ... + 196858.

It is an arithmetic number, because the mean of its divisors is an integer number (1536689800).

Almost surely, 2^12222222121 is an apocalyptic number.

It is an amenable number.

12222222121 is a deficient number, since it is larger than the sum of its proper divisors (71296279).

12222222121 is an equidigital number, since it uses as much as digits as its factorization.

12222222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78159.

The product of its digits is 256, while the sum is 19.

Adding to 12222222121 its reverse (12122222221), we get a palindrome (24344444342).

The spelling of 12222222121 in words is "twelve billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".