2021221321311 has 4 divisors (see below), whose sum is σ = 2694961761752. Its totient is φ = 1347480880872.

The previous prime is 2021221321291. The next prime is 2021221321319. The reversal of 2021221321311 is 1131231221202.

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

It is not a de Polignac number, because 2021221321311 - 2¹¹ = 2021221319263 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 (2021221321319) 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, 336870220216 + ... + 336870220221.

It is an arithmetic number, because the mean of its divisors is an integer number (673740440438).

Almost surely, 2^{2021221321311} is an apocalyptic number.

2021221321311 is a deficient number, since it is larger than the sum of its proper divisors (673740440441).

2021221321311 is an equidigital number, since it uses as much as digits as its factorization.

2021221321311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673740440440.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 2021221321311 its reverse (1131231221202), we get a palindrome (3152452542513).

The spelling of 2021221321311 in words is "two trillion, twenty-one billion, two hundred twenty-one million, three hundred twenty-one thousand, three hundred eleven".