13521022521 has 4 divisors (see below), whose sum is σ = 18028030032. Its totient is φ = 9014015012.

The previous prime is 13521022499. The next prime is 13521022547. The reversal of 13521022521 is 12522012531.

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 13521022521 - 2²¹ = 13518925369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13521022491 and 13521022500.

It is not an unprimeable number, because it can be changed into a prime (13521022561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2253503751 + ... + 2253503756.

It is an arithmetic number, because the mean of its divisors is an integer number (4507007508).

Almost surely, 2^13521022521 is an apocalyptic number.

It is an amenable number.

13521022521 is a deficient number, since it is larger than the sum of its proper divisors (4507007511).

13521022521 is an equidigital number, since it uses as much as digits as its factorization.

13521022521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4507007510.

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 13521022521 in words is "thirteen billion, five hundred twenty-one million, twenty-two thousand, five hundred twenty-one".