13155213304221 has 32 divisors (see below), whose sum is σ = 18163697664000. Its totient is φ = 8460250856640.

The previous prime is 13155213304201. The next prime is 13155213304231. The reversal of 13155213304221 is 12240331255131.

It is a happy number.

It is not a de Polignac number, because 13155213304221 - 2¹¹ = 13155213302173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13155213304201) 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, 105715180 + ... + 105839546.

It is an arithmetic number, because the mean of its divisors is an integer number (567615552000).

Almost surely, 2^{13155213304221} is an apocalyptic number.

It is an amenable number.

13155213304221 is a deficient number, since it is larger than the sum of its proper divisors (5008484359779).

13155213304221 is a wasteful number, since it uses less digits than its factorization.

13155213304221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128009.

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 13155213304221 its reverse (12240331255131), we get a palindrome (25395544559352).

The spelling of 13155213304221 in words is "thirteen trillion, one hundred fifty-five billion, two hundred thirteen million, three hundred four thousand, two hundred twenty-one".