2108311021 has 2 divisors, whose sum is σ = 2108311022. Its totient is φ = 2108311020.

The previous prime is 2108311001. The next prime is 2108311069. The reversal of 2108311021 is 1201138012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2048558121 + 59752900 = 45261^2 + 7730^2 .

It is a cyclic number.

It is not a de Polignac number, because 2108311021 - 2²³ = 2099922413 is a prime.

It is a super-2 number, since 2×2108311021² = 8889950722540124882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2108311021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2108311001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054155510 + 1054155511.

It is an arithmetic number, because the mean of its divisors is an integer number (1054155511).

Almost surely, 2^2108311021 is an apocalyptic number.

It is an amenable number.

2108311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2108311021 is an equidigital number, since it uses as much as digits as its factorization.

2108311021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 2108311021 is about 45916.3480799595. The cubic root of 2108311021 is about 1282.2662936982.

Adding to 2108311021 its reverse (1201138012), we get a palindrome (3309449033).

The spelling of 2108311021 in words is "two billion, one hundred eight million, three hundred eleven thousand, twenty-one".