20121111200999 has 4 divisors (see below), whose sum is σ = 20127006636936. Its totient is φ = 20115215765064.

The previous prime is 20121111200969. The next prime is 20121111201017. The reversal of 20121111200999 is 99900211112102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121111200999 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 (20121111200969) 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, 2947712849 + ... + 2947719674.

It is an arithmetic number, because the mean of its divisors is an integer number (5031751659234).

Almost surely, 2^{20121111200999} is an apocalyptic number.

20121111200999 is a deficient number, since it is larger than the sum of its proper divisors (5895435937).

20121111200999 is an equidigital number, since it uses as much as digits as its factorization.

20121111200999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5895435936.

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

The spelling of 20121111200999 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, two hundred thousand, nine hundred ninety-nine".