13108021 has 4 divisors (see below), whose sum is σ = 13128172. Its totient is φ = 13087872.

The previous prime is 13108019. The next prime is 13108033. The reversal of 13108021 is 12080131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6832996 + 6275025 = 2614^2 + 2505^2 .

It is a cyclic number.

It is not a de Polignac number, because 13108021 - 2¹ = 13108019 is a prime.

It is a super-4 number, since 4×13108021⁴ (a number of 30 digits) contains 4444 as substring.

It is the 3621-st Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13107986 and 13108004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13108001) by changing a digit.

It is a nontrivial repunit in base 3620.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9066 + ... + 10411.

It is an arithmetic number, because the mean of its divisors is an integer number (3282043).

Almost surely, 2^13108021 is an apocalyptic number.

It is an amenable number.

13108021 is a deficient number, since it is larger than the sum of its proper divisors (20151).

13108021 is an equidigital number, since it uses as much as digits as its factorization.

13108021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20150.

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

The square root of 13108021 is about 3620.5001035769. The cubic root of 13108021 is about 235.7829386453.

Adding to 13108021 its reverse (12080131), we get a palindrome (25188152).

The spelling of 13108021 in words is "thirteen million, one hundred eight thousand, twenty-one".