12122021056 has 56 divisors (see below), whose sum is σ = 24506925840. Its totient is φ = 5947425792.

The previous prime is 12122021053. The next prime is 12122021057. The reversal of 12122021056 is 65012022121.

It is not an unprimeable number, because it can be changed into a prime (12122021053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2312070 + ... + 2317306.

Almost surely, 2^12122021056 is an apocalyptic number.

12122021056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12122021056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12253462920).

12122021056 is an abundant number, since it is smaller than the sum of its proper divisors (12384904784).

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

12122021056 is an equidigital number, since it uses as much as digits as its factorization.

12122021056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5921 (or 5911 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 12122021056 its reverse (65012022121), we get a palindrome (77134043177).

The spelling of 12122021056 in words is "twelve billion, one hundred twenty-two million, twenty-one thousand, fifty-six".