2021311109 has 2 divisors, whose sum is σ = 2021311110. Its totient is φ = 2021311108.

The previous prime is 2021311099. The next prime is 2021311133. The reversal of 2021311109 is 9011131202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1728730084 + 292581025 = 41578^2 + 17105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021311109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021311199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010655554 + 1010655555.

It is an arithmetic number, because the mean of its divisors is an integer number (1010655555).

Almost surely, 2^2021311109 is an apocalyptic number.

It is an amenable number.

2021311109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021311109 is an equidigital number, since it uses as much as digits as its factorization.

2021311109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 2021311109 is about 44958.9936386481. The cubic root of 2021311109 is about 1264.3803010736.

The spelling of 2021311109 in words is "two billion, twenty-one million, three hundred eleven thousand, one hundred nine".