2021311021 has 2 divisors, whose sum is σ = 2021311022. Its totient is φ = 2021311020.

The previous prime is 2021311013. The next prime is 2021311027. The reversal of 2021311021 is 1201131202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1970116996 + 51194025 = 44386^2 + 7155^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021311021 - 2³ = 2021311013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021310992 and 2021311010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021311027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010655510 + 1010655511.

It is an arithmetic number, because the mean of its divisors is an integer number (1010655511).

Almost surely, 2^2021311021 is an apocalyptic number.

It is an amenable number.

2021311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021311021 is an equidigital number, since it uses as much as digits as its factorization.

2021311021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2021311021 is about 44958.9926599785. The cubic root of 2021311021 is about 1264.3802827249.

Adding to 2021311021 its reverse (1201131202), we get a palindrome (3222442223).

The spelling of 2021311021 in words is "two billion, twenty-one million, three hundred eleven thousand, twenty-one".