12021111997 has 2 divisors, whose sum is σ = 12021111998. Its totient is φ = 12021111996.

The previous prime is 12021111953. The next prime is 12021112001. The reversal of 12021111997 is 79911112021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10341669636 + 1679442361 = 101694^2 + 40981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021111997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021111917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010555998 + 6010555999.

It is an arithmetic number, because the mean of its divisors is an integer number (6010555999).

Almost surely, 2^12021111997 is an apocalyptic number.

It is an amenable number.

12021111997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021111997 is an equidigital number, since it uses as much as digits as its factorization.

12021111997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 34.

The spelling of 12021111997 in words is "twelve billion, twenty-one million, one hundred eleven thousand, nine hundred ninety-seven".