2100811 has 4 divisors (see below), whose sum is σ = 2211400. Its totient is φ = 1990224.

The previous prime is 2100803. The next prime is 2100821. The reversal of 2100811 is 1180012.

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

It is a cyclic number.

It is not a de Polignac number, because 2100811 - 2³ = 2100803 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100791 and 2100800.

It is not an unprimeable number, because it can be changed into a prime (2100821) 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, 55266 + ... + 55303.

It is an arithmetic number, because the mean of its divisors is an integer number (552850).

2^2100811 is an apocalyptic number.

2100811 is a deficient number, since it is larger than the sum of its proper divisors (110589).

2100811 is a wasteful number, since it uses less digits than its factorization.

2100811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110588.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2100811 is about 1449.4174691924. The cubic root of 2100811 is about 128.0743992930.

Adding to 2100811 its reverse (1180012), we get a palindrome (3280823).

The spelling of 2100811 in words is "two million, one hundred thousand, eight hundred eleven".