12122021987 has 2 divisors, whose sum is σ = 12122021988. Its totient is φ = 12122021986.

The previous prime is 12122021981. The next prime is 12122022037. The reversal of 12122021987 is 78912022121.

It is a weak prime.

It is an emirp because it is prime and its reverse (78912022121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12122021987 - 2⁸ = 12122021731 is a prime.

It is a super-2 number, since 2×12122021987² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12122021981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061010993 + 6061010994.

It is an arithmetic number, because the mean of its divisors is an integer number (6061010994).

Almost surely, 2^12122021987 is an apocalyptic number.

12122021987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122021987 is an equidigital number, since it uses as much as digits as its factorization.

12122021987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 12122021987 in words is "twelve billion, one hundred twenty-two million, twenty-one thousand, nine hundred eighty-seven".