12071221056 has 84 divisors (see below), whose sum is σ = 36421060000. Its totient is φ = 3811961088.

The previous prime is 12071220979. The next prime is 12071221061. The reversal of 12071221056 is 65012217021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540556 + ... + 562443.

Almost surely, 2^12071221056 is an apocalyptic number.

12071221056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12071221056 is an abundant number, since it is smaller than the sum of its proper divisors (24349838944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12071221056 is a wasteful number, since it uses less digits than its factorization.

12071221056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103036 (or 1103023 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

Adding to 12071221056 its reverse (65012217021), we get a palindrome (77083438077).

The spelling of 12071221056 in words is "twelve billion, seventy-one million, two hundred twenty-one thousand, fifty-six".