12421511 has 4 divisors (see below), whose sum is σ = 12466632. Its totient is φ = 12376392.

The previous prime is 12421501. The next prime is 12421517. The reversal of 12421511 is 11512421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11512421 = 3061 ⋅3761.

It is a cyclic number.

It is not a de Polignac number, because 12421511 - 2¹⁰ = 12420487 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12421511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421517) 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 3 ways as a sum of consecutive naturals, for example, 22145 + ... + 22698.

It is an arithmetic number, because the mean of its divisors is an integer number (3116658).

Almost surely, 2^12421511 is an apocalyptic number.

12421511 is a deficient number, since it is larger than the sum of its proper divisors (45121).

12421511 is an equidigital number, since it uses as much as digits as its factorization.

12421511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45120.

The product of its digits is 80, while the sum is 17.

The square root of 12421511 is about 3524.4164055911. The cubic root of 12421511 is about 231.5926698670.

Adding to 12421511 its reverse (11512421), we get a palindrome (23933932).

The spelling of 12421511 in words is "twelve million, four hundred twenty-one thousand, five hundred eleven".