2100101021987 has 2 divisors, whose sum is σ = 2100101021988. Its totient is φ = 2100101021986.

The previous prime is 2100101021981. The next prime is 2100101022007. The reversal of 2100101021987 is 7891201010012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2100101021987 - 2¹⁸ = 2100100759843 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100101021981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050050510993 + 1050050510994.

It is an arithmetic number, because the mean of its divisors is an integer number (1050050510994).

Almost surely, 2^{2100101021987} is an apocalyptic number.

2100101021987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100101021987 is an equidigital number, since it uses as much as digits as its factorization.

2100101021987 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.

Adding to 2100101021987 its reverse (7891201010012), we get a palindrome (9991302031999).

The spelling of 2100101021987 in words is "two trillion, one hundred billion, one hundred one million, twenty-one thousand, nine hundred eighty-seven".