2100549947 has 2 divisors, whose sum is σ = 2100549948. Its totient is φ = 2100549946.

The previous prime is 2100549929. The next prime is 2100550013. The reversal of 2100549947 is 7499450012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2100549947 - 2²² = 2096355643 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100549917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050274973 + 1050274974.

It is an arithmetic number, because the mean of its divisors is an integer number (1050274974).

Almost surely, 2^2100549947 is an apocalyptic number.

2100549947 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100549947 is an equidigital number, since it uses as much as digits as its factorization.

2100549947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 2100549947 is about 45831.7569704675. The cubic root of 2100549947 is about 1280.6909410514.

Adding to 2100549947 its reverse (7499450012), we get a palindrome (9599999959).

The spelling of 2100549947 in words is "two billion, one hundred million, five hundred forty-nine thousand, nine hundred forty-seven".