13011521 has 8 divisors (see below), whose sum is σ = 13210560. Its totient is φ = 12814128.

The previous prime is 13011487. The next prime is 13011529. The reversal of 13011521 is 12511031.

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 13011521 - 2¹⁴ = 12995137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13011496 and 13011505.

It is not an unprimeable number, because it can be changed into a prime (13011529) 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, 29420 + ... + 29858.

It is an arithmetic number, because the mean of its divisors is an integer number (1651320).

Almost surely, 2^13011521 is an apocalyptic number.

It is an amenable number.

13011521 is a deficient number, since it is larger than the sum of its proper divisors (199039).

13011521 is a wasteful number, since it uses less digits than its factorization.

13011521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 13011521 is about 3607.1485968837. The cubic root of 13011521 is about 235.2029091010.

Adding to 13011521 its reverse (12511031), we get a palindrome (25522552).

The spelling of 13011521 in words is "thirteen million, eleven thousand, five hundred twenty-one".