200021101009991 has 2 divisors, whose sum is σ = 200021101009992. Its totient is φ = 200021101009990.

The previous prime is 200021101009973. The next prime is 200021101010057. The reversal of 200021101009991 is 199900101120002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200021101009991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200021101069991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100010550504995 + 100010550504996.

It is an arithmetic number, because the mean of its divisors is an integer number (100010550504996).

Almost surely, 2^{200021101009991} is an apocalyptic number.

200021101009991 is a deficient number, since it is larger than the sum of its proper divisors (1).

200021101009991 is an equidigital number, since it uses as much as digits as its factorization.

200021101009991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 35.

Adding to 200021101009991 its reverse (199900101120002), we get a palindrome (399921202129993).

The spelling of 200021101009991 in words is "two hundred trillion, twenty-one billion, one hundred one million, nine thousand, nine hundred ninety-one".