12572921 has 4 divisors (see below), whose sum is σ = 13006500. Its totient is φ = 12139344.

The previous prime is 12572909. The next prime is 12572969. The reversal of 12572921 is 12927521.

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 5812921 + 6760000 = 2411^2 + 2600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12572921 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 433549 = 12572921 / (1 + 2 + 5 + 7 + 2 + 9 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (12572321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216746 + ... + 216803.

It is an arithmetic number, because the mean of its divisors is an integer number (3251625).

Almost surely, 2^12572921 is an apocalyptic number.

It is an amenable number.

12572921 is a deficient number, since it is larger than the sum of its proper divisors (433579).

12572921 is an equidigital number, since it uses as much as digits as its factorization.

12572921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433578.

The product of its digits is 2520, while the sum is 29.

The square root of 12572921 is about 3545.8314962784. The cubic root of 12572921 is about 232.5298593477.

The spelling of 12572921 in words is "twelve million, five hundred seventy-two thousand, nine hundred twenty-one".