13545121521 has 32 divisors (see below), whose sum is σ = 18974269440. Its totient is φ = 8578617344.

The previous prime is 13545121517. The next prime is 13545121523. The reversal of 13545121521 is 12512154531.

It is a cyclic number.

It is not a de Polignac number, because 13545121521 - 2² = 13545121517 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13545121523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7429216 + ... + 7431038.

It is an arithmetic number, because the mean of its divisors is an integer number (592945920).

Almost surely, 2^13545121521 is an apocalyptic number.

It is an amenable number.

13545121521 is a deficient number, since it is larger than the sum of its proper divisors (5429147919).

13545121521 is a wasteful number, since it uses less digits than its factorization.

13545121521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525.

The product of its digits is 6000, while the sum is 30.

The spelling of 13545121521 in words is "thirteen billion, five hundred forty-five million, one hundred twenty-one thousand, five hundred twenty-one".