4105120021 has 2 divisors, whose sum is σ = 4105120022. Its totient is φ = 4105120020.

The previous prime is 4105119973. The next prime is 4105120079. The reversal of 4105120021 is 1200215014.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2844088900 + 1261031121 = 53330^2 + 35511^2 .

It is a cyclic number.

It is not a de Polignac number, because 4105120021 - 2⁹ = 4105119509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4105119977 and 4105120004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4105160021) 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 as a sum of consecutive naturals, namely, 2052560010 + 2052560011.

It is an arithmetic number, because the mean of its divisors is an integer number (2052560011).

Almost surely, 2^4105120021 is an apocalyptic number.

It is an amenable number.

4105120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4105120021 is an equidigital number, since it uses as much as digits as its factorization.

4105120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 4105120021 is about 64071.2105473277. The cubic root of 4105120021 is about 1601.1866224713.

Adding to 4105120021 its reverse (1200215014), we get a palindrome (5305335035).

The spelling of 4105120021 in words is "four billion, one hundred five million, one hundred twenty thousand, twenty-one".