2105240947 has 2 divisors, whose sum is σ = 2105240948. Its totient is φ = 2105240946.

The previous prime is 2105240909. The next prime is 2105240953. The reversal of 2105240947 is 7490425012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105240947 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105240987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052620473 + 1052620474.

It is an arithmetic number, because the mean of its divisors is an integer number (1052620474).

Almost surely, 2^2105240947 is an apocalyptic number.

2105240947 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105240947 is an equidigital number, since it uses as much as digits as its factorization.

2105240947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 2105240947 is about 45882.9047358600. The cubic root of 2105240947 is about 1281.6435891196.

Adding to 2105240947 its reverse (7490425012), we get a palindrome (9595665959).

The spelling of 2105240947 in words is "two billion, one hundred five million, two hundred forty thousand, nine hundred forty-seven".