21112020009999 has 16 divisors (see below), whose sum is σ = 31464354512640. Its totient is φ = 13990400482680.

The previous prime is 21112020009973. The next prime is 21112020010007. The reversal of 21112020009999 is 99990002021112.

It is not a de Polignac number, because 21112020009999 - 2¹⁷ = 21112019878927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112020009799) 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 15 ways as a sum of consecutive naturals, for example, 2341093297 + ... + 2341102314.

It is an arithmetic number, because the mean of its divisors is an integer number (1966522157040).

Almost surely, 2^{21112020009999} is an apocalyptic number.

21112020009999 is a deficient number, since it is larger than the sum of its proper divisors (10352334502641).

21112020009999 is a wasteful number, since it uses less digits than its factorization.

21112020009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682195787 (or 4682195781 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The spelling of 21112020009999 in words is "twenty-one trillion, one hundred twelve billion, twenty million, nine thousand, nine hundred ninety-nine".