210021121001987 has 2 divisors, whose sum is σ = 210021121001988. Its totient is φ = 210021121001986.

The previous prime is 210021121001981. The next prime is 210021121002031. The reversal of 210021121001987 is 789100121120012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210021121001987 - 2³⁸ = 209746243095043 is a prime.

It is not a weakly prime, because it can be changed into another prime (210021121001981) 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, 105010560500993 + 105010560500994.

It is an arithmetic number, because the mean of its divisors is an integer number (105010560500994).

Almost surely, 2^{210021121001987} is an apocalyptic number.

210021121001987 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021121001987 is an equidigital number, since it uses as much as digits as its factorization.

210021121001987 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 35.

Adding to 210021121001987 its reverse (789100121120012), we get a palindrome (999121242121999).

The spelling of 210021121001987 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty-one million, one thousand, nine hundred eighty-seven".