20011211100999 has 12 divisors (see below), whose sum is σ = 28980552896256. Its totient is φ = 13305975003072.

The previous prime is 20011211100997. The next prime is 20011211101001. The reversal of 20011211100999 is 99900111211002.

It is an interprime number because it is at equal distance from previous prime (20011211100997) and next prime (20011211101001).

It is not a de Polignac number, because 20011211100999 - 2¹ = 20011211100997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011211100997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2902696162 + ... + 2902703055.

It is an arithmetic number, because the mean of its divisors is an integer number (2415046074688).

Almost surely, 2^{20011211100999} is an apocalyptic number.

20011211100999 is a deficient number, since it is larger than the sum of its proper divisors (8969341795257).

20011211100999 is a wasteful number, since it uses less digits than its factorization.

20011211100999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5805399606 (or 5805399603 counting only the distinct ones).

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

The spelling of 20011211100999 in words is "twenty trillion, eleven billion, two hundred eleven million, one hundred thousand, nine hundred ninety-nine".