12721085 has 8 divisors (see below), whose sum is σ = 16439640. Its totient is φ = 9393984.

The previous prime is 12721043. The next prime is 12721087. The reversal of 12721085 is 58012721.

It can be written as a sum of positive squares in 4 ways, for example, as 139876 + 12581209 = 374^2 + 3547^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12721085 - 2¹⁰ = 12720061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97790 + ... + 97919.

It is an arithmetic number, because the mean of its divisors is an integer number (2054955).

Almost surely, 2^12721085 is an apocalyptic number.

It is an amenable number.

12721085 is a deficient number, since it is larger than the sum of its proper divisors (3718555).

12721085 is a wasteful number, since it uses less digits than its factorization.

12721085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195727.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 12721085 is about 3566.6630062287. The cubic root of 12721085 is about 233.4397009369.

It can be divided in two parts, 127 and 21085, that added together give a palindrome (21212).

The spelling of 12721085 in words is "twelve million, seven hundred twenty-one thousand, eighty-five".