2021321311 has 4 divisors (see below), whose sum is σ = 2022151824. Its totient is φ = 2020490800.

The previous prime is 2021321299. The next prime is 2021321333. The reversal of 2021321311 is 1131231202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1131231202 = 2 ⋅565615601.

It is a cyclic number.

It is not a de Polignac number, because 2021321311 - 2¹¹ = 2021319263 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 (2021321371) 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, 411595 + ... + 416476.

It is an arithmetic number, because the mean of its divisors is an integer number (505537956).

Almost surely, 2^2021321311 is an apocalyptic number.

2021321311 is a deficient number, since it is larger than the sum of its proper divisors (830513).

2021321311 is an equidigital number, since it uses as much as digits as its factorization.

2021321311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830512.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2021321311 is about 44959.1070974502. The cubic root of 2021321311 is about 1264.3824282715.

Adding to 2021321311 its reverse (1131231202), we get a palindrome (3152552513).

The spelling of 2021321311 in words is "two billion, twenty-one million, three hundred twenty-one thousand, three hundred eleven".