10120209991 has 2 divisors, whose sum is σ = 10120209992. Its totient is φ = 10120209990.

The previous prime is 10120209971. The next prime is 10120210033. The reversal of 10120209991 is 19990202101.

10120209991 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 10120209991 - 2⁵ = 10120209959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10120209901) 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, 5060104995 + 5060104996.

It is an arithmetic number, because the mean of its divisors is an integer number (5060104996).

Almost surely, 2^10120209991 is an apocalyptic number.

10120209991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10120209991 is an equidigital number, since it uses as much as digits as its factorization.

10120209991 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 34.

The spelling of 10120209991 in words is "ten billion, one hundred twenty million, two hundred nine thousand, nine hundred ninety-one".