1021210201987 has 4 divisors (see below), whose sum is σ = 1021212673936. Its totient is φ = 1021207730040.

The previous prime is 1021210201937. The next prime is 1021210201993. The reversal of 1021210201987 is 7891020121201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021210201987 - 2³⁵ = 986850463619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021210201937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449463 + ... + 1498144.

It is an arithmetic number, because the mean of its divisors is an integer number (255303168484).

Almost surely, 2^{1021210201987} is an apocalyptic number.

1021210201987 is a deficient number, since it is larger than the sum of its proper divisors (2471949).

1021210201987 is an equidigital number, since it uses as much as digits as its factorization.

1021210201987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471948.

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

The spelling of 1021210201987 in words is "one trillion, twenty-one billion, two hundred ten million, two hundred one thousand, nine hundred eighty-seven".