2101102001 has 4 divisors (see below), whose sum is σ = 2101493604. Its totient is φ = 2100710400.

The previous prime is 2101101979. The next prime is 2101102013. The reversal of 2101102001 is 1002011012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 790734400 + 1310367601 = 28120^2 + 36199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101102001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101102001.

It is not an unprimeable number, because it can be changed into a prime (2101102021) 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 3 ways as a sum of consecutive naturals, for example, 187640 + ... + 198521.

It is an arithmetic number, because the mean of its divisors is an integer number (525373401).

Almost surely, 2^2101102001 is an apocalyptic number.

It is an amenable number.

2101102001 is a deficient number, since it is larger than the sum of its proper divisors (391603).

2101102001 is an equidigital number, since it uses as much as digits as its factorization.

2101102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391602.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2101102001 is about 45837.7791892234. The cubic root of 2101102001 is about 1280.8031257405.

Adding to 2101102001 its reverse (1002011012), we get a palindrome (3103113013).

The spelling of 2101102001 in words is "two billion, one hundred one million, one hundred two thousand, one".