1121020021987 has 2 divisors, whose sum is σ = 1121020021988. Its totient is φ = 1121020021986.

The previous prime is 1121020021831. The next prime is 1121020022047. The reversal of 1121020021987 is 7891200201211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121020021987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121020021087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560510010993 + 560510010994.

It is an arithmetic number, because the mean of its divisors is an integer number (560510010994).

Almost surely, 2^{1121020021987} is an apocalyptic number.

1121020021987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121020021987 is an equidigital number, since it uses as much as digits as its factorization.

1121020021987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 1121020021987 in words is "one trillion, one hundred twenty-one billion, twenty million, twenty-one thousand, nine hundred eighty-seven".