12006521 has 2 divisors, whose sum is σ = 12006522. Its totient is φ = 12006520.

The previous prime is 12006509. The next prime is 12006523. The reversal of 12006521 is 12560021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11999296 + 7225 = 3464^2 + 85^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12006521 is a prime.

It is a Sophie Germain prime.

Together with 12006523, it forms a pair of twin primes.

It is a Chen prime.

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 12006521.

It is not a weakly prime, because it can be changed into another prime (12006523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6003260 + 6003261.

It is an arithmetic number, because the mean of its divisors is an integer number (6003261).

Almost surely, 2^12006521 is an apocalyptic number.

It is an amenable number.

12006521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12006521 is an equidigital number, since it uses as much as digits as its factorization.

12006521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 12006521 is about 3465.0427125795. The cubic root of 12006521 is about 228.9843114542.

Adding to 12006521 its reverse (12560021), we get a palindrome (24566542).

The spelling of 12006521 in words is "twelve million, six thousand, five hundred twenty-one".