13521221532551 has 8 divisors (see below), whose sum is σ = 14316623555760. Its totient is φ = 12725823515008.

The previous prime is 13521221532529. The next prime is 13521221532593. The reversal of 13521221532551 is 15523512212531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-13521221532551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521221532521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8552525 + ... + 10009401.

It is an arithmetic number, because the mean of its divisors is an integer number (1789577944470).

Almost surely, 2^{13521221532551} is an apocalyptic number.

13521221532551 is a deficient number, since it is larger than the sum of its proper divisors (795402023209).

13521221532551 is a wasteful number, since it uses less digits than its factorization.

13521221532551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002833.

The product of its digits is 90000, while the sum is 38.

The spelling of 13521221532551 in words is "thirteen trillion, five hundred twenty-one billion, two hundred twenty-one million, five hundred thirty-two thousand, five hundred fifty-one".