13155230221 has 4 divisors (see below), whose sum is σ = 15034548832. Its totient is φ = 11275911612.

The previous prime is 13155230197. The next prime is 13155230237. The reversal of 13155230221 is 12203255131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13155230221 - 2⁷ = 13155230093 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 (13155234221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939659295 + ... + 939659308.

It is an arithmetic number, because the mean of its divisors is an integer number (3758637208).

Almost surely, 2^13155230221 is an apocalyptic number.

It is an amenable number.

13155230221 is a deficient number, since it is larger than the sum of its proper divisors (1879318611).

13155230221 is an equidigital number, since it uses as much as digits as its factorization.

13155230221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879318610.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 13155230221 its reverse (12203255131), we get a palindrome (25358485352).

The spelling of 13155230221 in words is "thirteen billion, one hundred fifty-five million, two hundred thirty thousand, two hundred twenty-one".