12209621 has 8 divisors (see below), whose sum is σ = 13023360. Its totient is φ = 11406528.

The previous prime is 12209591. The next prime is 12209623. The reversal of 12209621 is 12690221.

12209621 = T₁₁₉₀ + T₁₁₉₁ + ... + T₁₂₀₆.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12209621 - 2¹⁰ = 12208597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12209623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221 + ... + 4946.

It is an arithmetic number, because the mean of its divisors is an integer number (1627920).

Almost surely, 2^12209621 is an apocalyptic number.

It is an amenable number.

12209621 is a deficient number, since it is larger than the sum of its proper divisors (813739).

12209621 is a wasteful number, since it uses less digits than its factorization.

12209621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 12209621 is about 3494.2268100397. The cubic root of 12209621 is about 230.2682503435.

Adding to 12209621 its reverse (12690221), we get a palindrome (24899842).

The spelling of 12209621 in words is "twelve million, two hundred nine thousand, six hundred twenty-one".