2021021111999 has 4 divisors (see below), whose sum is σ = 2030599411320. Its totient is φ = 2011442812680.

The previous prime is 2021021111981. The next prime is 2021021112041. The reversal of 2021021111999 is 9991111201202.

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 2021021111999 - 2⁴⁰ = 921509484223 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 (2021021111929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4789149344 + ... + 4789149765.

It is an arithmetic number, because the mean of its divisors is an integer number (507649852830).

Almost surely, 2^{2021021111999} is an apocalyptic number.

2021021111999 is a deficient number, since it is larger than the sum of its proper divisors (9578299321).

2021021111999 is an equidigital number, since it uses as much as digits as its factorization.

2021021111999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9578299320.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 2021021111999 in words is "two trillion, twenty-one billion, twenty-one million, one hundred eleven thousand, nine hundred ninety-nine".