13154251543221 has 16 divisors (see below), whose sum is σ = 17559484156928. Its totient is φ = 8759263590000.

The previous prime is 13154251543201. The next prime is 13154251543247. The reversal of 13154251543221 is 12234515245131.

It is not a de Polignac number, because 13154251543221 - 2⁷ = 13154251543093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13154251543221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13154251543201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14216100 + ... + 15113106.

It is an arithmetic number, because the mean of its divisors is an integer number (1097467759808).

Almost surely, 2^{13154251543221} is an apocalyptic number.

It is an amenable number.

13154251543221 is a deficient number, since it is larger than the sum of its proper divisors (4405232613707).

13154251543221 is a wasteful number, since it uses less digits than its factorization.

13154251543221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902712.

The product of its digits is 144000, while the sum is 39.

Adding to 13154251543221 its reverse (12234515245131), we get a palindrome (25388766788352).

The spelling of 13154251543221 in words is "thirteen trillion, one hundred fifty-four billion, two hundred fifty-one million, five hundred forty-three thousand, two hundred twenty-one".