10012000111991 has 2 divisors, whose sum is σ = 10012000111992. Its totient is φ = 10012000111990.

The previous prime is 10012000111979. The next prime is 10012000112159. The reversal of 10012000111991 is 19911100021001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10012000111991 - 2¹⁰ = 10012000110967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10012000111991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10012000111591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5006000055995 + 5006000055996.

It is an arithmetic number, because the mean of its divisors is an integer number (5006000055996).

Almost surely, 2^{10012000111991} is an apocalyptic number.

10012000111991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10012000111991 is an equidigital number, since it uses as much as digits as its factorization.

10012000111991 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 26.

Adding to 10012000111991 its reverse (19911100021001), we get a palindrome (29923100132992).

The spelling of 10012000111991 in words is "ten trillion, twelve billion, one hundred eleven thousand, nine hundred ninety-one".