12016521 has 12 divisors (see below), whose sum is σ = 18935280. Its totient is φ = 7282680.

The previous prime is 12016507. The next prime is 12016541. The reversal of 12016521 is 12561021.

12016521 is a `hidden beast` number, since 12 + 0 + 1 + 652 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-12016521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12016494 and 12016503.

It is not an unprimeable number, because it can be changed into a prime (12016541) 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, 60591 + ... + 60788.

It is an arithmetic number, because the mean of its divisors is an integer number (1577940).

Almost surely, 2^12016521 is an apocalyptic number.

12016521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12016521 is a deficient number, since it is larger than the sum of its proper divisors (6918759).

12016521 is a wasteful number, since it uses less digits than its factorization.

12016521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121396 (or 121393 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 12016521 is about 3466.4853959017. The cubic root of 12016521 is about 229.0478660200.

Adding to 12016521 its reverse (12561021), we get a palindrome (24577542).

It can be divided in two parts, 120 and 16521, that added together give a square (16641 = 129²).

The spelling of 12016521 in words is "twelve million, sixteen thousand, five hundred twenty-one".