12012223121 has 2 divisors, whose sum is σ = 12012223122. Its totient is φ = 12012223120.

The previous prime is 12012223079. The next prime is 12012223141. The reversal of 12012223121 is 12132221021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11368890625 + 643332496 = 106625^2 + 25364^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012223121 - 2¹⁰ = 12012222097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12012223121.

It is not a weakly prime, because it can be changed into another prime (12012223141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006111560 + 6006111561.

It is an arithmetic number, because the mean of its divisors is an integer number (6006111561).

Almost surely, 2^12012223121 is an apocalyptic number.

It is an amenable number.

12012223121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012223121 is an equidigital number, since it uses as much as digits as its factorization.

12012223121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12012223121 its reverse (12132221021), we get a palindrome (24144444142).

The spelling of 12012223121 in words is "twelve billion, twelve million, two hundred twenty-three thousand, one hundred twenty-one".