13130021 has 4 divisors (see below), whose sum is σ = 13140672. Its totient is φ = 13119372.

The previous prime is 13130009. The next prime is 13130027. The reversal of 13130021 is 12003131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13130021 - 2¹⁴ = 13113637 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 13129984 and 13130011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13130027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3191 + ... + 6036.

It is an arithmetic number, because the mean of its divisors is an integer number (3285168).

Almost surely, 2^13130021 is an apocalyptic number.

It is an amenable number.

13130021 is a deficient number, since it is larger than the sum of its proper divisors (10651).

13130021 is an equidigital number, since it uses as much as digits as its factorization.

13130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10650.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 13130021 is about 3623.5370841210. The cubic root of 13130021 is about 235.9147745987.

Adding to 13130021 its reverse (12003131), we get a palindrome (25133152).

The spelling of 13130021 in words is "thirteen million, one hundred thirty thousand, twenty-one".