1121021101987 has 2 divisors, whose sum is σ = 1121021101988. Its totient is φ = 1121021101986.

The previous prime is 1121021101979. The next prime is 1121021102029. The reversal of 1121021101987 is 7891011201211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1121021101987 - 2³ = 1121021101979 is a prime.

It is a super-2 number, since 2×1121021101987² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1121021101927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560510550993 + 560510550994.

It is an arithmetic number, because the mean of its divisors is an integer number (560510550994).

Almost surely, 2^{1121021101987} is an apocalyptic number.

1121021101987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121021101987 is an equidigital number, since it uses as much as digits as its factorization.

1121021101987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 34.

The spelling of 1121021101987 in words is "one trillion, one hundred twenty-one billion, twenty-one million, one hundred one thousand, nine hundred eighty-seven".