13211621 has 8 divisors (see below), whose sum is σ = 13643520. Its totient is φ = 12785472.

The previous prime is 13211603. The next prime is 13211623. The reversal of 13211621 is 12611231.

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 13211621 - 2²² = 9017317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13211621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13211623) 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, 3500 + ... + 6218.

It is an arithmetic number, because the mean of its divisors is an integer number (1705440).

Almost surely, 2^13211621 is an apocalyptic number.

It is an amenable number.

13211621 is a deficient number, since it is larger than the sum of its proper divisors (431899).

13211621 is a wasteful number, since it uses less digits than its factorization.

13211621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875.

The product of its digits is 72, while the sum is 17.

The square root of 13211621 is about 3634.7793605665. The cubic root of 13211621 is about 236.4024839815.

Adding to 13211621 its reverse (12611231), we get a palindrome (25822852).

The spelling of 13211621 in words is "thirteen million, two hundred eleven thousand, six hundred twenty-one".