13212621 has 12 divisors (see below), whose sum is σ = 20207772. Its totient is φ = 8290176.

The previous prime is 13212607. The next prime is 13212629. The reversal of 13212621 is 12621231.

13212621 is a `hidden beast` number, since 1 + 32 + 12 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9696996 + 3515625 = 3114^2 + 1875^2 .

It is not a de Polignac number, because 13212621 - 2⁹ = 13212109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13212594 and 13212603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13212629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43026 + ... + 43331.

It is an arithmetic number, because the mean of its divisors is an integer number (1683981).

Almost surely, 2^13212621 is an apocalyptic number.

It is an amenable number.

13212621 is a deficient number, since it is larger than the sum of its proper divisors (6995151).

13212621 is a wasteful number, since it uses less digits than its factorization.

13212621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86380 (or 86377 counting only the distinct ones).

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

The square root of 13212621 is about 3634.9169178951. The cubic root of 13212621 is about 236.4084483397.

Adding to 13212621 its reverse (12621231), we get a palindrome (25833852).

The spelling of 13212621 in words is "thirteen million, two hundred twelve thousand, six hundred twenty-one".