13221242155 has 8 divisors (see below), whose sum is σ = 17307807984. Its totient is φ = 9615448800.

The previous prime is 13221242149. The next prime is 13221242171. The reversal of 13221242155 is 55124212231.

It is a happy number.

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-13221242155 is a prime.

It is a super-2 number, since 2×13221242155² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 120193056 + ... + 120193165.

It is an arithmetic number, because the mean of its divisors is an integer number (2163475998).

Almost surely, 2^13221242155 is an apocalyptic number.

13221242155 is a deficient number, since it is larger than the sum of its proper divisors (4086565829).

13221242155 is a wasteful number, since it uses less digits than its factorization.

13221242155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240386237.

The product of its digits is 4800, while the sum is 28.

Adding to 13221242155 its reverse (55124212231), we get a palindrome (68345454386).

The spelling of 13221242155 in words is "thirteen billion, two hundred twenty-one million, two hundred forty-two thousand, one hundred fifty-five".