12102012121 has 2 divisors, whose sum is σ = 12102012122. Its totient is φ = 12102012120.

The previous prime is 12102012113. The next prime is 12102012137. The reversal of 12102012121 is 12121020121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10781707225 + 1320304896 = 103835^2 + 36336^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102012121 - 2³ = 12102012113 is a prime.

It is not a weakly prime, because it can be changed into another prime (12102012151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6051006060 + 6051006061.

It is an arithmetic number, because the mean of its divisors is an integer number (6051006061).

Almost surely, 2^12102012121 is an apocalyptic number.

It is an amenable number.

12102012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12102012121 is an equidigital number, since it uses as much as digits as its factorization.

12102012121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12102012121 its reverse (12121020121), we get a palindrome (24223032242).

The spelling of 12102012121 in words is "twelve billion, one hundred two million, twelve thousand, one hundred twenty-one".