2021111009999 has 4 divisors (see below), whose sum is σ = 2041122010200. Its totient is φ = 2001100009800.

The previous prime is 2021111009971. The next prime is 2021111010007. The reversal of 2021111009999 is 9999001111202.

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

It is a cyclic number.

It is not a de Polignac number, because 2021111009999 - 2³⁶ = 1952391533263 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 (2021111009909) 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 3 ways as a sum of consecutive naturals, for example, 10005499949 + ... + 10005500150.

It is an arithmetic number, because the mean of its divisors is an integer number (510280502550).

Almost surely, 2^{2021111009999} is an apocalyptic number.

2021111009999 is a deficient number, since it is larger than the sum of its proper divisors (20011000201).

2021111009999 is a wasteful number, since it uses less digits than its factorization.

2021111009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20011000200.

The product of its (nonzero) digits is 26244, while the sum is 44.

The spelling of 2021111009999 in words is "two trillion, twenty-one billion, one hundred eleven million, nine thousand, nine hundred ninety-nine".