3221207656 has 16 divisors (see below), whose sum is σ = 6047223840. Its totient is φ = 1608614640.

The previous prime is 3221207641. The next prime is 3221207669. The reversal of 3221207656 is 6567021223.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241756 + ... + 254731.

It is an arithmetic number, because the mean of its divisors is an integer number (377951490).

Almost surely, 2^3221207656 is an apocalyptic number.

It is an amenable number.

3221207656 is a deficient number, since it is larger than the sum of its proper divisors (2826016184).

3221207656 is a wasteful number, since it uses less digits than its factorization.

3221207656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497304 (or 497300 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 3221207656 is about 56755.6839091910. The cubic root of 3221207656 is about 1476.8608372371.

Adding to 3221207656 its reverse (6567021223), we get a palindrome (9788228879).

The spelling of 3221207656 in words is "three billion, two hundred twenty-one million, two hundred seven thousand, six hundred fifty-six".