2100120647 has 2 divisors, whose sum is σ = 2100120648. Its totient is φ = 2100120646.

The previous prime is 2100120623. The next prime is 2100120661. The reversal of 2100120647 is 7460210012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100120647 - 2¹⁸ = 2099858503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100120047) 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, 1050060323 + 1050060324.

It is an arithmetic number, because the mean of its divisors is an integer number (1050060324).

Almost surely, 2^2100120647 is an apocalyptic number.

2100120647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100120647 is an equidigital number, since it uses as much as digits as its factorization.

2100120647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2100120647 is about 45827.0732973425. The cubic root of 2100120647 is about 1280.6036880154.

Adding to 2100120647 its reverse (7460210012), we get a palindrome (9560330659).

The spelling of 2100120647 in words is "two billion, one hundred million, one hundred twenty thousand, six hundred forty-seven".