13071521 has 16 divisors (see below), whose sum is σ = 14629248. Its totient is φ = 11616000.

The previous prime is 13071511. The next prime is 13071523. The reversal of 13071521 is 12517031.

13071521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13071521 - 2¹⁴ = 13055137 is a prime.

It is a super-2 number, since 2×13071521² = 341729322506882, which contains 22 as substring.

It is a deceptive number, since it divides R_13071520.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13071493 and 13071502.

It is not an unprimeable number, because it can be changed into a prime (13071523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39326 + ... + 39656.

It is an arithmetic number, because the mean of its divisors is an integer number (914328).

Almost surely, 2^13071521 is an apocalyptic number.

It is an amenable number.

13071521 is a deficient number, since it is larger than the sum of its proper divisors (1557727).

13071521 is a wasteful number, since it uses less digits than its factorization.

13071521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 13071521 is about 3615.4558495437. The cubic root of 13071521 is about 235.5638850426.

Adding to 13071521 its reverse (12517031), we get a palindrome (25588552).

The spelling of 13071521 in words is "thirteen million, seventy-one thousand, five hundred twenty-one".