2105335021 has 2 divisors, whose sum is σ = 2105335022. Its totient is φ = 2105335020.

The previous prime is 2105335019. The next prime is 2105335049. The reversal of 2105335021 is 1205335012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2096632521 + 8702500 = 45789^2 + 2950^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105335021 - 2¹ = 2105335019 is a prime.

Together with 2105335019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2105334983 and 2105335001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105335081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052667510 + 1052667511.

It is an arithmetic number, because the mean of its divisors is an integer number (1052667511).

Almost surely, 2^2105335021 is an apocalyptic number.

It is an amenable number.

2105335021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105335021 is an equidigital number, since it uses as much as digits as its factorization.

2105335021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 2105335021 is about 45883.9298774636. The cubic root of 2105335021 is about 1281.6626791820.

Subtracting from 2105335021 its reverse (1205335012), we obtain a palindrome (900000009).

The spelling of 2105335021 in words is "two billion, one hundred five million, three hundred thirty-five thousand, twenty-one".