20111201099999 has 16 divisors (see below), whose sum is σ = 21486214874880. Its totient is φ = 18767855208960.

The previous prime is 20111201099989. The next prime is 20111201100059. The reversal of 20111201099999 is 99999010211102.

It is a cyclic number.

It is not a de Polignac number, because 20111201099999 - 2²⁴ = 20111184322783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111201099999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111201099909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53831054 + ... + 54203364.

It is an arithmetic number, because the mean of its divisors is an integer number (1342888429680).

Almost surely, 2^{20111201099999} is an apocalyptic number.

20111201099999 is a deficient number, since it is larger than the sum of its proper divisors (1375013774881).

20111201099999 is a wasteful number, since it uses less digits than its factorization.

20111201099999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414830.

The product of its (nonzero) digits is 236196, while the sum is 53.

The spelling of 20111201099999 in words is "twenty trillion, one hundred eleven billion, two hundred one million, ninety-nine thousand, nine hundred ninety-nine".