12213621 has 24 divisors (see below), whose sum is σ = 21041280. Its totient is φ = 6674976.

The previous prime is 12213601. The next prime is 12213623. The reversal of 12213621 is 12631221.

It is not a de Polignac number, because 12213621 - 2⁷ = 12213493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12213594 and 12213603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2766 + ... + 5663.

It is an arithmetic number, because the mean of its divisors is an integer number (876720).

Almost surely, 2^12213621 is an apocalyptic number.

It is an amenable number.

12213621 is a deficient number, since it is larger than the sum of its proper divisors (8827659).

12213621 is a wasteful number, since it uses less digits than its factorization.

12213621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8465 (or 8462 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 12213621 is about 3494.7991358589. The cubic root of 12213621 is about 230.2933936965.

Adding to 12213621 its reverse (12631221), we get a palindrome (24844842).

The spelling of 12213621 in words is "twelve million, two hundred thirteen thousand, six hundred twenty-one".