2100812801 has 4 divisors (see below), whose sum is σ = 2192152512. Its totient is φ = 2009473092.

The previous prime is 2100812789. The next prime is 2100812803. The reversal of 2100812801 is 1082180012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2100812801 - 2⁶ = 2100812737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 91339687 = 2100812801 / (2 + 1 + 0 + 0 + 8 + 1 + 2 + 8 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100812803) 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, 45669821 + ... + 45669866.

It is an arithmetic number, because the mean of its divisors is an integer number (548038128).

Almost surely, 2^2100812801 is an apocalyptic number.

It is an amenable number.

2100812801 is a deficient number, since it is larger than the sum of its proper divisors (91339711).

2100812801 is an equidigital number, since it uses as much as digits as its factorization.

2100812801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91339710.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 2100812801 is about 45834.6244775715. The cubic root of 2100812801 is about 1280.7443589189.

Adding to 2100812801 its reverse (1082180012), we get a palindrome (3182992813).

The spelling of 2100812801 in words is "two billion, one hundred million, eight hundred twelve thousand, eight hundred one".