2004224021 has 4 divisors (see below), whose sum is σ = 2006188044. Its totient is φ = 2002260000.

The previous prime is 2004224011. The next prime is 2004224077. The reversal of 2004224021 is 1204224002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1109556100 + 894667921 = 33310^2 + 29911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2004224021 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 (2004224011) 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, 980480 + ... + 982521.

It is an arithmetic number, because the mean of its divisors is an integer number (501547011).

Almost surely, 2^2004224021 is an apocalyptic number.

It is an amenable number.

2004224021 is a deficient number, since it is larger than the sum of its proper divisors (1964023).

2004224021 is a wasteful number, since it uses less digits than its factorization.

2004224021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964022.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 2004224021 is about 44768.5606313180. The cubic root of 2004224021 is about 1260.8074150121.

Adding to 2004224021 its reverse (1204224002), we get a palindrome (3208448023).

The spelling of 2004224021 in words is "two billion, four million, two hundred twenty-four thousand, twenty-one".