12621247 has 4 divisors (see below), whose sum is σ = 13028416. Its totient is φ = 12214080.

The previous prime is 12621241. The next prime is 12621251. The reversal of 12621247 is 74212621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12621247 - 2¹¹ = 12619199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621241) 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, 203538 + ... + 203599.

It is an arithmetic number, because the mean of its divisors is an integer number (3257104).

Almost surely, 2^12621247 is an apocalyptic number.

12621247 is a deficient number, since it is larger than the sum of its proper divisors (407169).

12621247 is an equidigital number, since it uses as much as digits as its factorization.

12621247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407168.

The product of its digits is 1344, while the sum is 25.

The square root of 12621247 is about 3552.6394413168. The cubic root of 12621247 is about 232.8274001574.

Adding to 12621247 its reverse (74212621), we get a palindrome (86833868).

The spelling of 12621247 in words is "twelve million, six hundred twenty-one thousand, two hundred forty-seven".