2100209809601 has 4 divisors (see below), whose sum is σ = 2100212978052. Its totient is φ = 2100206641152.

The previous prime is 2100209809597. The next prime is 2100209809639. The reversal of 2100209809601 is 1069089020012.

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 1884788511376 + 215421298225 = 1372876^2 + 464135^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100209809601 - 2² = 2100209809597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2100209802601) 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, 167840 + ... + 2056353.

It is an arithmetic number, because the mean of its divisors is an integer number (525053244513).

Almost surely, 2^{2100209809601} is an apocalyptic number.

It is an amenable number.

2100209809601 is a deficient number, since it is larger than the sum of its proper divisors (3168451).

2100209809601 is an equidigital number, since it uses as much as digits as its factorization.

2100209809601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3168450.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 2100209809601 in words is "two trillion, one hundred billion, two hundred nine million, eight hundred nine thousand, six hundred one".