2021020311 has 4 divisors (see below), whose sum is σ = 2694693752. Its totient is φ = 1347346872.

The previous prime is 2021020273. The next prime is 2021020381. The reversal of 2021020311 is 1130201202.

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

It is not a de Polignac number, because 2021020311 - 2⁶ = 2021020247 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 (2021020381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336836716 + ... + 336836721.

It is an arithmetic number, because the mean of its divisors is an integer number (673673438).

Almost surely, 2^2021020311 is an apocalyptic number.

2021020311 is a deficient number, since it is larger than the sum of its proper divisors (673673441).

2021020311 is an equidigital number, since it uses as much as digits as its factorization.

2021020311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673673440.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2021020311 is about 44955.7594864106. The cubic root of 2021020311 is about 1264.3196643752.

Adding to 2021020311 its reverse (1130201202), we get a palindrome (3151221513).

The spelling of 2021020311 in words is "two billion, twenty-one million, twenty thousand, three hundred eleven".