12020211997 has 2 divisors, whose sum is σ = 12020211998. Its totient is φ = 12020211996.

The previous prime is 12020211979. The next prime is 12020212033. The reversal of 12020211997 is 79911202021.

It is a happy number.

Together with previous prime (12020211979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11216716281 + 803495716 = 105909^2 + 28346^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020211997 - 2⁷ = 12020211869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12020211197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010105998 + 6010105999.

It is an arithmetic number, because the mean of its divisors is an integer number (6010105999).

Almost surely, 2^12020211997 is an apocalyptic number.

It is an amenable number.

12020211997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12020211997 is an equidigital number, since it uses as much as digits as its factorization.

12020211997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 12020211997 in words is "twelve billion, twenty million, two hundred eleven thousand, nine hundred ninety-seven".