1121000009999 has 4 divisors (see below), whose sum is σ = 1124989334160. Its totient is φ = 1117010685840.

The previous prime is 1121000009989. The next prime is 1121000010007. The reversal of 1121000009999 is 9999000001211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1121000009999 - 2²⁴ = 1120983232783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121000009929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1994661659 + ... + 1994662220.

It is an arithmetic number, because the mean of its divisors is an integer number (281247333540).

Almost surely, 2^{1121000009999} is an apocalyptic number.

1121000009999 is a deficient number, since it is larger than the sum of its proper divisors (3989324161).

1121000009999 is an equidigital number, since it uses as much as digits as its factorization.

1121000009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989324160.

The product of its (nonzero) digits is 13122, while the sum is 41.

The spelling of 1121000009999 in words is "one trillion, one hundred twenty-one billion, nine thousand, nine hundred ninety-nine".