12021225455520 has 288 divisors, whose sum is σ = 41165369154000. Its totient is φ = 3194506985472.

The previous prime is 12021225455509. The next prime is 12021225455527. The reversal of 12021225455520 is 2555452212021.

12021225455520 is a `hidden beast` number, since 1 + 2 + 0 + 2 + 122 + 5 + 4 + 5 + 5 + 520 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 3470724288144 + 8550501167376 = 1862988^2 + 2924124^2 .

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×12021225455520² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (12021225455527) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 596606406 + ... + 596626554.

Almost surely, 2^{12021225455520} is an apocalyptic number.

12021225455520 is a gapful number since it is divisible by the number (10) 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 12021225455520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20582684577000).

12021225455520 is an abundant number, since it is smaller than the sum of its proper divisors (29144143698480).

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

12021225455520 is a wasteful number, since it uses less digits than its factorization.

12021225455520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21592 (or 21581 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

Adding to 12021225455520 its reverse (2555452212021), we get a palindrome (14576677667541).

The spelling of 12021225455520 in words is "twelve trillion, twenty-one billion, two hundred twenty-five million, four hundred fifty-five thousand, five hundred twenty".