12051521 has 4 divisors (see below), whose sum is σ = 12760452. Its totient is φ = 11342592.

The previous prime is 12051509. The next prime is 12051541. The reversal of 12051521 is 12515021.

12051521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6195121 + 5856400 = 2489^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 12051521 - 2¹⁰ = 12050497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 708913 = 12051521 / (1 + 2 + 0 + 5 + 1 + 5 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12051521.

It is not an unprimeable number, because it can be changed into a prime (12051541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354440 + ... + 354473.

It is an arithmetic number, because the mean of its divisors is an integer number (3190113).

Almost surely, 2^12051521 is an apocalyptic number.

It is an amenable number.

12051521 is a deficient number, since it is larger than the sum of its proper divisors (708931).

12051521 is an equidigital number, since it uses as much as digits as its factorization.

12051521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708930.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 12051521 is about 3471.5300661236. The cubic root of 12051521 is about 229.2700297285.

Adding to 12051521 its reverse (12515021), we get a palindrome (24566542).

The spelling of 12051521 in words is "twelve million, fifty-one thousand, five hundred twenty-one".