12107120021 has 2 divisors, whose sum is σ = 12107120022. Its totient is φ = 12107120020.

The previous prime is 12107119951. The next prime is 12107120041. The reversal of 12107120021 is 12002170121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11520802225 + 586317796 = 107335^2 + 24214^2 .

It is an emirp because it is prime and its reverse (12002170121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12107120021 - 2³⁰ = 11033378197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12107120041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6053560010 + 6053560011.

It is an arithmetic number, because the mean of its divisors is an integer number (6053560011).

Almost surely, 2^12107120021 is an apocalyptic number.

It is an amenable number.

12107120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12107120021 is an equidigital number, since it uses as much as digits as its factorization.

12107120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 12107120021 its reverse (12002170121), we get a palindrome (24109290142).

The spelling of 12107120021 in words is "twelve billion, one hundred seven million, one hundred twenty thousand, twenty-one".