13531201521 has 4 divisors (see below), whose sum is σ = 18041602032. Its totient is φ = 9020801012.

The previous prime is 13531201417. The next prime is 13531201549. The reversal of 13531201521 is 12510213531.

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.

It is a cyclic number.

It is not a de Polignac number, because 13531201521 - 2⁷ = 13531201393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13531201491 and 13531201500.

It is not an unprimeable number, because it can be changed into a prime (13531208521) 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, 2255200251 + ... + 2255200256.

It is an arithmetic number, because the mean of its divisors is an integer number (4510400508).

Almost surely, 2^13531201521 is an apocalyptic number.

It is an amenable number.

13531201521 is a deficient number, since it is larger than the sum of its proper divisors (4510400511).

13531201521 is an equidigital number, since it uses as much as digits as its factorization.

13531201521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510400510.

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 13531201521 in words is "thirteen billion, five hundred thirty-one million, two hundred one thousand, five hundred twenty-one".