12021215552 has 14 divisors (see below), whose sum is σ = 23854599738. Its totient is φ = 6010607744.

The previous prime is 12021215543. The next prime is 12021215597. The reversal of 12021215552 is 25551212021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11256361216 + 764854336 = 106096^2 + 27656^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93915683 + ... + 93915810.

Almost surely, 2^12021215552 is an apocalyptic number.

It is an amenable number.

12021215552 is a deficient number, since it is larger than the sum of its proper divisors (11833384186).

12021215552 is an equidigital number, since it uses as much as digits as its factorization.

12021215552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187831505 (or 187831495 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 12021215552 its reverse (25551212021), we get a palindrome (37572427573).

The spelling of 12021215552 in words is "twelve billion, twenty-one million, two hundred fifteen thousand, five hundred fifty-two".