12567421 has 4 divisors (see below), whose sum is σ = 12659292. Its totient is φ = 12475552.

The previous prime is 12567419. The next prime is 12567433. The reversal of 12567421 is 12476521.

12567421 = T₃₅₈ + T₃₅₉ + ... + T₄₉₄.

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 10432900 + 2134521 = 3230^2 + 1461^2 .

It is a cyclic number.

It is not a de Polignac number, because 12567421 - 2¹ = 12567419 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 12567421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12567491) 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, 45730 + ... + 46003.

It is an arithmetic number, because the mean of its divisors is an integer number (3164823).

Almost surely, 2^12567421 is an apocalyptic number.

It is an amenable number.

12567421 is a deficient number, since it is larger than the sum of its proper divisors (91871).

12567421 is an equidigital number, since it uses as much as digits as its factorization.

12567421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91870.

The product of its digits is 3360, while the sum is 28.

The square root of 12567421 is about 3545.0558528745. The cubic root of 12567421 is about 232.4959478232.

The spelling of 12567421 in words is "twelve million, five hundred sixty-seven thousand, four hundred twenty-one".