2104420021 has 24 divisors (see below), whose sum is σ = 2454060672. Its totient is φ = 1796995200.

The previous prime is 2104420009. The next prime is 2104420051. The reversal of 2104420021 is 1200244012.

It is a de Polignac number, because none of the positive numbers 2^k-2104420021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2104419977 and 2104420004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2104420051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1873366 + ... + 1874488.

It is an arithmetic number, because the mean of its divisors is an integer number (102252528).

Almost surely, 2^2104420021 is an apocalyptic number.

It is an amenable number.

2104420021 is a deficient number, since it is larger than the sum of its proper divisors (349640651).

2104420021 is a wasteful number, since it uses less digits than its factorization.

2104420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073 (or 2062 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2104420021 is about 45873.9579827161. The cubic root of 2104420021 is about 1281.4769777342.

Adding to 2104420021 its reverse (1200244012), we get a palindrome (3304664033).

The spelling of 2104420021 in words is "two billion, one hundred four million, four hundred twenty thousand, twenty-one".