210001012021987 has 2 divisors, whose sum is σ = 210001012021988. Its totient is φ = 210001012021986.

The previous prime is 210001012021981. The next prime is 210001012022069. The reversal of 210001012021987 is 789120210100012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210001012021987 - 2¹⁹ = 210001011497699 is a prime.

It is not a weakly prime, because it can be changed into another prime (210001012021981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000506010993 + 105000506010994.

It is an arithmetic number, because the mean of its divisors is an integer number (105000506010994).

Almost surely, 2^{210001012021987} is an apocalyptic number.

210001012021987 is a deficient number, since it is larger than the sum of its proper divisors (1).

210001012021987 is an equidigital number, since it uses as much as digits as its factorization.

210001012021987 is an evil number, because the sum of its binary digits is even.

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

Adding to 210001012021987 its reverse (789120210100012), we get a palindrome (999121222121999).

The spelling of 210001012021987 in words is "two hundred ten trillion, one billion, twelve million, twenty-one thousand, nine hundred eighty-seven".