12021121997 has 2 divisors, whose sum is σ = 12021121998. Its totient is φ = 12021121996.

The previous prime is 12021121969. The next prime is 12021122033. The reversal of 12021121997 is 79912112021.

12021121997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6044440516 + 5976681481 = 77746^2 + 77309^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021121997 - 2⁶ = 12021121933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021121397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010560998 + 6010560999.

It is an arithmetic number, because the mean of its divisors is an integer number (6010560999).

Almost surely, 2^12021121997 is an apocalyptic number.

It is an amenable number.

12021121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021121997 is an equidigital number, since it uses as much as digits as its factorization.

12021121997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 35.

The spelling of 12021121997 in words is "twelve billion, twenty-one million, one hundred twenty-one thousand, nine hundred ninety-seven".