1211101121987 has 2 divisors, whose sum is σ = 1211101121988. Its totient is φ = 1211101121986.

The previous prime is 1211101121981. The next prime is 1211101122031. The reversal of 1211101121987 is 7891211011121.

It is a weak prime.

It is an emirp because it is prime and its reverse (7891211011121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211101121987 - 2²⁰ = 1211100073411 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211101121981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605550560993 + 605550560994.

It is an arithmetic number, because the mean of its divisors is an integer number (605550560994).

Almost surely, 2^{1211101121987} is an apocalyptic number.

1211101121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211101121987 is an equidigital number, since it uses as much as digits as its factorization.

1211101121987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 35.

The spelling of 1211101121987 in words is "one trillion, two hundred eleven billion, one hundred one million, one hundred twenty-one thousand, nine hundred eighty-seven".