2100101999 has 4 divisors (see below), whose sum is σ = 2100683064. Its totient is φ = 2099520936.

The previous prime is 2100101957. The next prime is 2100102001. The reversal of 2100101999 is 9991010012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100101999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100101909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285077 + ... + 292350.

It is an arithmetic number, because the mean of its divisors is an integer number (525170766).

Almost surely, 2^2100101999 is an apocalyptic number.

2100101999 is a deficient number, since it is larger than the sum of its proper divisors (581065).

2100101999 is an equidigital number, since it uses as much as digits as its factorization.

2100101999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581064.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 2100101999 is about 45826.8698363744. The cubic root of 2100101999 is about 1280.5998976350.

The spelling of 2100101999 in words is "two billion, one hundred million, one hundred one thousand, nine hundred ninety-nine".