12587221 has 4 divisors (see below), whose sum is σ = 12599500. Its totient is φ = 12574944.

The previous prime is 12587219. The next prime is 12587227. The reversal of 12587221 is 12278521.

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 2283121 + 10304100 = 1511^2 + 3210^2 .

It is a cyclic number.

It is not a de Polignac number, because 12587221 - 2¹ = 12587219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12587221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12587227) 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, 4446 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (3149875).

Almost surely, 2^12587221 is an apocalyptic number.

It is an amenable number.

12587221 is a deficient number, since it is larger than the sum of its proper divisors (12279).

12587221 is a wasteful number, since it uses less digits than its factorization.

12587221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12278.

The product of its digits is 2240, while the sum is 28.

The square root of 12587221 is about 3547.8473755222. The cubic root of 12587221 is about 232.6179830526.

The spelling of 12587221 in words is "twelve million, five hundred eighty-seven thousand, two hundred twenty-one".