12521257 has 8 divisors (see below), whose sum is σ = 14343296. Its totient is φ = 10707552.

The previous prime is 12521239. The next prime is 12521291. The reversal of 12521257 is 75212521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12521257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1573 + ... + 5245.

It is an arithmetic number, because the mean of its divisors is an integer number (1792912).

Almost surely, 2^12521257 is an apocalyptic number.

It is an amenable number.

12521257 is a deficient number, since it is larger than the sum of its proper divisors (1822039).

12521257 is an equidigital number, since it uses as much as digits as its factorization.

12521257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4167.

The product of its digits is 1400, while the sum is 25.

The square root of 12521257 is about 3538.5388227346. The cubic root of 12521257 is about 232.2109221837.

Adding to 12521257 its reverse (75212521), we get a palindrome (87733778).

The spelling of 12521257 in words is "twelve million, five hundred twenty-one thousand, two hundred fifty-seven".