12266621 has 4 divisors (see below), whose sum is σ = 12315744. Its totient is φ = 12217500.

The previous prime is 12266591. The next prime is 12266629. The reversal of 12266621 is 12666221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12666221 = 2243 ⋅5647.

It is a cyclic number.

It is not a de Polignac number, because 12266621 - 2¹⁰ = 12265597 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 (12266629) 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, 24185 + ... + 24686.

It is an arithmetic number, because the mean of its divisors is an integer number (3078936).

Almost surely, 2^12266621 is an apocalyptic number.

It is an amenable number.

12266621 is a deficient number, since it is larger than the sum of its proper divisors (49123).

12266621 is an equidigital number, since it uses as much as digits as its factorization.

12266621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49122.

The product of its digits is 1728, while the sum is 26.

The square root of 12266621 is about 3502.3736237015. The cubic root of 12266621 is about 230.6260260724.

It can be divided in two parts, 1 and 2266621, that added together give a palindrome (2266622).

The spelling of 12266621 in words is "twelve million, two hundred sixty-six thousand, six hundred twenty-one".