12021020129 has 2 divisors, whose sum is σ = 12021020130. Its totient is φ = 12021020128.

The previous prime is 12021019949. The next prime is 12021020159. The reversal of 12021020129 is 92102012021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8378656225 + 3642363904 = 91535^2 + 60352^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021020129 - 2²⁰ = 12019971553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12021020129.

It is not a weakly prime, because it can be changed into another prime (12021020159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010510064 + 6010510065.

It is an arithmetic number, because the mean of its divisors is an integer number (6010510065).

Almost surely, 2^12021020129 is an apocalyptic number.

It is an amenable number.

12021020129 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021020129 is an equidigital number, since it uses as much as digits as its factorization.

12021020129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 12021020129 in words is "twelve billion, twenty-one million, twenty thousand, one hundred twenty-nine".