3205440221 has 4 divisors (see below), whose sum is σ = 3205567200. Its totient is φ = 3205313244.

The previous prime is 3205440193. The next prime is 3205440223. The reversal of 3205440221 is 1220445023.

It is a happy number.

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 not a de Polignac number, because 3205440221 - 2⁶ = 3205440157 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 (3205440223) 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, 11351 + ... + 80868.

It is an arithmetic number, because the mean of its divisors is an integer number (801391800).

Almost surely, 2^3205440221 is an apocalyptic number.

It is an amenable number.

3205440221 is a deficient number, since it is larger than the sum of its proper divisors (126979).

3205440221 is an equidigital number, since it uses as much as digits as its factorization.

3205440221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126978.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 3205440221 is about 56616.6072897343. The cubic root of 3205440221 is about 1474.4472077343.

Adding to 3205440221 its reverse (1220445023), we get a palindrome (4425885244).

The spelling of 3205440221 in words is "three billion, two hundred five million, four hundred forty thousand, two hundred twenty-one".