2100823 has 4 divisors (see below), whose sum is σ = 2157640. Its totient is φ = 2044008.

The previous prime is 2100821. The next prime is 2100841. The reversal of 2100823 is 3280012.

It is a happy number.

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 2100823 - 2¹ = 2100821 is a prime.

It is a Duffinian number.

2100823 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2100797 and 2100806.

It is a congruent number.

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, 28353 + ... + 28426.

It is an arithmetic number, because the mean of its divisors is an integer number (539410).

2^2100823 is an apocalyptic number.

2100823 is a deficient number, since it is larger than the sum of its proper divisors (56817).

2100823 is an equidigital number, since it uses as much as digits as its factorization.

2100823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56816.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2100823 is about 1449.4216087806. The cubic root of 2100823 is about 128.0746431496.

Adding to 2100823 its reverse (3280012), we get a palindrome (5380835).

The spelling of 2100823 in words is "two million, one hundred thousand, eight hundred twenty-three".