2100999947 has 2 divisors, whose sum is σ = 2100999948. Its totient is φ = 2100999946.

The previous prime is 2100999937. The next prime is 2101000007. The reversal of 2100999947 is 7499990012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2100999947 - 2¹⁰ = 2100998923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100999895 and 2100999904.

It is not a weakly prime, because it can be changed into another prime (2100999907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050499973 + 1050499974.

It is an arithmetic number, because the mean of its divisors is an integer number (1050499974).

Almost surely, 2^2100999947 is an apocalyptic number.

2100999947 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100999947 is an equidigital number, since it uses as much as digits as its factorization.

2100999947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 50.

The square root of 2100999947 is about 45836.6659673236. The cubic root of 2100999947 is about 1280.7823884959.

The spelling of 2100999947 in words is "two billion, one hundred million, nine hundred ninety-nine thousand, nine hundred forty-seven".