1020100121987 has 2 divisors, whose sum is σ = 1020100121988. Its totient is φ = 1020100121986.

The previous prime is 1020100121969. The next prime is 1020100122047. The reversal of 1020100121987 is 7891210010201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020100121987 - 2²⁴ = 1020083344771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020100121087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510050060993 + 510050060994.

It is an arithmetic number, because the mean of its divisors is an integer number (510050060994).

Almost surely, 2^{1020100121987} is an apocalyptic number.

1020100121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020100121987 is an equidigital number, since it uses as much as digits as its factorization.

1020100121987 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 32.

The spelling of 1020100121987 in words is "one trillion, twenty billion, one hundred million, one hundred twenty-one thousand, nine hundred eighty-seven".