2108321821 has 8 divisors (see below), whose sum is σ = 2148975360. Its totient is φ = 2067700752.

The previous prime is 2108321807. The next prime is 2108321851. The reversal of 2108321821 is 1281238012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2108321821 - 2⁷ = 2108321693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2108321821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108321851) 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 7 ways as a sum of consecutive naturals, for example, 153640 + ... + 166798.

It is an arithmetic number, because the mean of its divisors is an integer number (268621920).

Almost surely, 2^2108321821 is an apocalyptic number.

It is an amenable number.

2108321821 is a deficient number, since it is larger than the sum of its proper divisors (40653539).

2108321821 is a wasteful number, since it uses less digits than its factorization.

2108321821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16235.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 2108321821 is about 45916.4656849806. The cubic root of 2108321821 is about 1282.2684832000.

Adding to 2108321821 its reverse (1281238012), we get a palindrome (3389559833).

The spelling of 2108321821 in words is "two billion, one hundred eight million, three hundred twenty-one thousand, eight hundred twenty-one".