12541541532221 has 8 divisors (see below), whose sum is σ = 13506945301080. Its totient is φ = 11576233449792.

The previous prime is 12541541532167. The next prime is 12541541532229. The reversal of 12541541532221 is 12223514514521.

It can be written as a sum of positive squares in 4 ways, for example, as 5419635216121 + 7121906316100 = 2328011^2 + 2668690^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12541541532221 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 (12541541532229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23649266 + ... + 24173763.

It is an arithmetic number, because the mean of its divisors is an integer number (1688368162635).

Almost surely, 2^{12541541532221} is an apocalyptic number.

It is an amenable number.

12541541532221 is a deficient number, since it is larger than the sum of its proper divisors (965403768859).

12541541532221 is a wasteful number, since it uses less digits than its factorization.

12541541532221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47843215.

The product of its digits is 96000, while the sum is 38.

The spelling of 12541541532221 in words is "twelve trillion, five hundred forty-one billion, five hundred forty-one million, five hundred thirty-two thousand, two hundred twenty-one".