12721153 has 4 divisors (see below), whose sum is σ = 12729348. Its totient is φ = 12712960.

The previous prime is 12721147. The next prime is 12721157. The reversal of 12721153 is 35112721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5919489 + 6801664 = 2433^2 + 2608^2 .

It is a cyclic number.

It is not a de Polignac number, because 12721153 - 2²¹ = 10624001 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12721157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 976 + ... + 5137.

It is an arithmetic number, because the mean of its divisors is an integer number (3182337).

Almost surely, 2^12721153 is an apocalyptic number.

It is an amenable number.

12721153 is a deficient number, since it is larger than the sum of its proper divisors (8195).

12721153 is an equidigital number, since it uses as much as digits as its factorization.

12721153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8194.

The product of its digits is 420, while the sum is 22.

The square root of 12721153 is about 3566.6725389360. The cubic root of 12721153 is about 233.4401168834.

Adding to 12721153 its reverse (35112721), we get a palindrome (47833874).

The spelling of 12721153 in words is "twelve million, seven hundred twenty-one thousand, one hundred fifty-three".