2104544621 has 4 divisors (see below), whose sum is σ = 2104642752. Its totient is φ = 2104446492.

The previous prime is 2104544569. The next prime is 2104544623. The reversal of 2104544621 is 1264454012.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2104544621 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 (2104544623) 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 3 ways as a sum of consecutive naturals, for example, 1571 + ... + 64896.

It is an arithmetic number, because the mean of its divisors is an integer number (526160688).

Almost surely, 2^2104544621 is an apocalyptic number.

It is an amenable number.

2104544621 is a deficient number, since it is larger than the sum of its proper divisors (98131).

2104544621 is an equidigital number, since it uses as much as digits as its factorization.

2104544621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98130.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 2104544621 is about 45875.3160316090. The cubic root of 2104544621 is about 1281.5022687691.

Adding to 2104544621 its reverse (1264454012), we get a palindrome (3368998633).

The spelling of 2104544621 in words is "two billion, one hundred four million, five hundred forty-four thousand, six hundred twenty-one".