2021221021999 has 4 divisors (see below), whose sum is σ = 2086421700160. Its totient is φ = 1956020343840.

The previous prime is 2021221021997. The next prime is 2021221022003. The reversal of 2021221021999 is 9991201221202.

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 2021221021999 - 2¹ = 2021221021997 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 (2021221021997) 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, 32600339034 + ... + 32600339095.

It is an arithmetic number, because the mean of its divisors is an integer number (521605425040).

Almost surely, 2^{2021221021999} is an apocalyptic number.

2021221021999 is a deficient number, since it is larger than the sum of its proper divisors (65200678161).

2021221021999 is an equidigital number, since it uses as much as digits as its factorization.

2021221021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65200678160.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 2021221021999 in words is "two trillion, twenty-one billion, two hundred twenty-one million, twenty-one thousand, nine hundred ninety-nine".