10100020991 has 2 divisors, whose sum is σ = 10100020992. Its totient is φ = 10100020990.

The previous prime is 10100020979. The next prime is 10100021033. The reversal of 10100020991 is 19902000101.

10100020991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10100020991 - 2¹⁰ = 10100019967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10100020591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050010495 + 5050010496.

It is an arithmetic number, because the mean of its divisors is an integer number (5050010496).

Almost surely, 2^10100020991 is an apocalyptic number.

10100020991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10100020991 is an equidigital number, since it uses as much as digits as its factorization.

10100020991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 10100020991 in words is "ten billion, one hundred million, twenty thousand, nine hundred ninety-one".