1001210110991 has 2 divisors, whose sum is σ = 1001210110992. Its totient is φ = 1001210110990.

The previous prime is 1001210110969. The next prime is 1001210111003. The reversal of 1001210110991 is 1990110121001.

1001210110991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (1990110121001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001210110991 - 2²² = 1001205916687 is a prime.

It is a super-2 number, since 2×1001210110991² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1001210110991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001210110921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500605055495 + 500605055496.

It is an arithmetic number, because the mean of its divisors is an integer number (500605055496).

Almost surely, 2^{1001210110991} is an apocalyptic number.

1001210110991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001210110991 is an equidigital number, since it uses as much as digits as its factorization.

1001210110991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 26.

Adding to 1001210110991 its reverse (1990110121001), we get a palindrome (2991320231992).

The spelling of 1001210110991 in words is "one trillion, one billion, two hundred ten million, one hundred ten thousand, nine hundred ninety-one".