12021552 has 60 divisors (see below), whose sum is σ = 34741824. Its totient is φ = 3876480.

The previous prime is 12021551. The next prime is 12021577. The reversal of 12021552 is 25512021.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12021551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3118 + ... + 5810.

Almost surely, 2^12021552 is an apocalyptic number.

12021552 is a gapful number since it is divisible by the number (12) 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 12021552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17370912).

12021552 is an abundant number, since it is smaller than the sum of its proper divisors (22720272).

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

12021552 is a wasteful number, since it uses less digits than its factorization.

12021552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738 (or 2729 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 12021552 is about 3467.2109829083. The cubic root of 12021552 is about 229.0798269909.

Adding to 12021552 its reverse (25512021), we get a palindrome (37533573).

The spelling of 12021552 in words is "twelve million, twenty-one thousand, five hundred fifty-two".