12906521 has 4 divisors (see below), whose sum is σ = 13020852. Its totient is φ = 12792192.

The previous prime is 12906511. The next prime is 12906527. The reversal of 12906521 is 12560921.

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 403225 + 12503296 = 635^2 + 3536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12906521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12906527) 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, 56996 + ... + 57221.

It is an arithmetic number, because the mean of its divisors is an integer number (3255213).

Almost surely, 2^12906521 is an apocalyptic number.

It is an amenable number.

12906521 is a deficient number, since it is larger than the sum of its proper divisors (114331).

12906521 is a wasteful number, since it uses less digits than its factorization.

12906521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114330.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 12906521 is about 3592.5646827858. The cubic root of 12906521 is about 234.5685216718.

The spelling of 12906521 in words is "twelve million, nine hundred six thousand, five hundred twenty-one".