2101949975 has 6 divisors (see below), whose sum is σ = 2606418000. Its totient is φ = 1681559960.

The previous prime is 2101949903. The next prime is 2101949977. The reversal of 2101949975 is 5799491012.

It is not a de Polignac number, because 2101949975 - 2⁸ = 2101949719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101949977) 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 in 5 ways as a sum of consecutive naturals, for example, 42038975 + ... + 42039024.

It is an arithmetic number, because the mean of its divisors is an integer number (434403000).

Almost surely, 2^2101949975 is an apocalyptic number.

2101949975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2101949975 is a deficient number, since it is larger than the sum of its proper divisors (504468025).

2101949975 is an equidigital number, since it uses as much as digits as its factorization.

2101949975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84078009 (or 84078004 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 47.

The square root of 2101949975 is about 45847.0279843743. The cubic root of 2101949975 is about 1280.9754070279.

The spelling of 2101949975 in words is "two billion, one hundred one million, nine hundred forty-nine thousand, nine hundred seventy-five".