12211621 has 8 divisors (see below), whose sum is σ = 12528320. Its totient is φ = 11899008.

The previous prime is 12211603. The next prime is 12211657. The reversal of 12211621 is 12611221.

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 12211621 - 2²¹ = 10114469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12211595 and 12211604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211021) 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 7 ways as a sum of consecutive naturals, for example, 5560 + ... + 7438.

It is an arithmetic number, because the mean of its divisors is an integer number (1566040).

Almost surely, 2^12211621 is an apocalyptic number.

It is an amenable number.

12211621 is a deficient number, since it is larger than the sum of its proper divisors (316699).

12211621 is an equidigital number, since it uses as much as digits as its factorization.

12211621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043.

The product of its digits is 48, while the sum is 16.

The square root of 12211621 is about 3494.5129846661. The cubic root of 12211621 is about 230.2808227063.

Adding to 12211621 its reverse (12611221), we get a palindrome (24822842).

The spelling of 12211621 in words is "twelve million, two hundred eleven thousand, six hundred twenty-one".