20121011100999 has 6 divisors (see below), whose sum is σ = 29063682701456. Its totient is φ = 13414007400660.

The previous prime is 20121011100991. The next prime is 20121011101001. The reversal of 20121011100999 is 99900111012102.

It is not a de Polignac number, because 20121011100999 - 2³ = 20121011100991 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 (20121011100991) 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, 1117833950047 + ... + 1117833950064.

Almost surely, 2^{20121011100999} is an apocalyptic number.

20121011100999 is a deficient number, since it is larger than the sum of its proper divisors (8942671600457).

20121011100999 is a wasteful number, since it uses less digits than its factorization.

20121011100999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235667900117 (or 2235667900114 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 36.

The spelling of 20121011100999 in words is "twenty trillion, one hundred twenty-one billion, eleven million, one hundred thousand, nine hundred ninety-nine".