12121110109987 has 2 divisors, whose sum is σ = 12121110109988. Its totient is φ = 12121110109986.

The previous prime is 12121110109981. The next prime is 12121110110029. The reversal of 12121110109987 is 78990101112121.

12121110109987 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 is an emirp because it is prime and its reverse (78990101112121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12121110109987 - 2⁷ = 12121110109859 is a prime.

It is not a weakly prime, because it can be changed into another prime (12121110109981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060555054993 + 6060555054994.

It is an arithmetic number, because the mean of its divisors is an integer number (6060555054994).

Almost surely, 2^{12121110109987} is an apocalyptic number.

12121110109987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121110109987 is an equidigital number, since it uses as much as digits as its factorization.

12121110109987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 43.

The spelling of 12121110109987 in words is "twelve trillion, one hundred twenty-one billion, one hundred ten million, one hundred nine thousand, nine hundred eighty-seven".