12021009997 has 2 divisors, whose sum is σ = 12021009998. Its totient is φ = 12021009996.

The previous prime is 12021009991. The next prime is 12021010009. The reversal of 12021009997 is 79990012021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11963765641 + 57244356 = 109379^2 + 7566^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021009997 - 2¹⁹ = 12020485709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021009991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010504998 + 6010504999.

It is an arithmetic number, because the mean of its divisors is an integer number (6010504999).

Almost surely, 2^12021009997 is an apocalyptic number.

It is an amenable number.

12021009997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021009997 is an equidigital number, since it uses as much as digits as its factorization.

12021009997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 40.

The spelling of 12021009997 in words is "twelve billion, twenty-one million, nine thousand, nine hundred ninety-seven".