1002001121987 has 2 divisors, whose sum is σ = 1002001121988. Its totient is φ = 1002001121986.

The previous prime is 1002001121971. The next prime is 1002001122079. The reversal of 1002001121987 is 7891211002001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1002001121987 - 2⁴ = 1002001121971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1002001123987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501000560993 + 501000560994.

It is an arithmetic number, because the mean of its divisors is an integer number (501000560994).

Almost surely, 2^{1002001121987} is an apocalyptic number.

1002001121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002001121987 is an equidigital number, since it uses as much as digits as its factorization.

1002001121987 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 32.

Adding to 1002001121987 its reverse (7891211002001), we get a palindrome (8893212123988).

The spelling of 1002001121987 in words is "one trillion, two billion, one million, one hundred twenty-one thousand, nine hundred eighty-seven".