2104806821 has 8 divisors (see below), whose sum is σ = 2278585344. Its totient is φ = 1932724080.

The previous prime is 2104806799. The next prime is 2104806853. The reversal of 2104806821 is 1286084012.

It is a happy number.

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 2104806821 - 2¹⁴ = 2104790437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2104806421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421361 + ... + 426326.

It is an arithmetic number, because the mean of its divisors is an integer number (284823168).

Almost surely, 2^2104806821 is an apocalyptic number.

It is an amenable number.

2104806821 is a deficient number, since it is larger than the sum of its proper divisors (173778523).

2104806821 is a wasteful number, since it uses less digits than its factorization.

2104806821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847891.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 2104806821 is about 45878.1736885853. The cubic root of 2104806821 is about 1281.5554862899. Note that the first 3 decimals are identical.

The spelling of 2104806821 in words is "two billion, one hundred four million, eight hundred six thousand, eight hundred twenty-one".