999120010212101 has 6 divisors (see below), whose sum is σ = 1008040025979090. Its totient is φ = 990278240197568.

The previous prime is 999120010212067. The next prime is 999120010212127. The reversal of 999120010212101 is 101212010021999.

It can be written as a sum of positive squares in 3 ways, for example, as 51829186164001 + 947290824048100 = 7199249^2 + 30778090^2 .

It is not a de Polignac number, because 999120010212101 - 2¹⁰ = 999120010211077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999120015212101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39122863346 + ... + 39122888883.

It is an arithmetic number, because the mean of its divisors is an integer number (168006670996515).

Almost surely, 2^{999120010212101} is an apocalyptic number.

It is an amenable number.

999120010212101 is a deficient number, since it is larger than the sum of its proper divisors (8920015766989).

999120010212101 is an equidigital number, since it uses as much as digits as its factorization.

999120010212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78245752455 (or 78245752342 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 999120010212101 in words is "nine hundred ninety-nine trillion, one hundred twenty billion, ten million, two hundred twelve thousand, one hundred one".