2004213221 has 4 divisors (see below), whose sum is σ = 2005243500. Its totient is φ = 2003182944.

The previous prime is 2004213217. The next prime is 2004213223. The reversal of 2004213221 is 1223124002.

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 1259469121 + 744744100 = 35489^2 + 27290^2 .

It is a cyclic number.

It is not a de Polignac number, because 2004213221 - 2² = 2004213217 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 2004213221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2004213223) 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, 512216 + ... + 516113.

It is an arithmetic number, because the mean of its divisors is an integer number (501310875).

Almost surely, 2^2004213221 is an apocalyptic number.

It is an amenable number.

2004213221 is a deficient number, since it is larger than the sum of its proper divisors (1030279).

2004213221 is a wasteful number, since it uses less digits than its factorization.

2004213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030278.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2004213221 is about 44768.4400107933. The cubic root of 2004213221 is about 1260.8051503377.

Adding to 2004213221 its reverse (1223124002), we get a palindrome (3227337223).

The spelling of 2004213221 in words is "two billion, four million, two hundred thirteen thousand, two hundred twenty-one".