12216304646 has 32 divisors (see below), whose sum is σ = 22560138048. Its totient is φ = 4831332480.

The previous prime is 12216304631. The next prime is 12216304699. The reversal of 12216304646 is 64640361221.

It is a super-3 number, since 3×12216304646³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 723476 + ... + 740168.

It is an arithmetic number, because the mean of its divisors is an integer number (705004314).

Almost surely, 2^12216304646 is an apocalyptic number.

12216304646 is a deficient number, since it is larger than the sum of its proper divisors (10343833402).

12216304646 is a wasteful number, since it uses less digits than its factorization.

12216304646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20736.

The product of its (nonzero) digits is 41472, while the sum is 35.

Adding to 12216304646 its reverse (64640361221), we get a palindrome (76856665867).

The spelling of 12216304646 in words is "twelve billion, two hundred sixteen million, three hundred four thousand, six hundred forty-six".