13551123221 has 8 divisors (see below), whose sum is σ = 13850229600. Its totient is φ = 13254499440.

The previous prime is 13551123211. The next prime is 13551123227. The reversal of 13551123221 is 12232115531.

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-13551123221 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 (13551123227) 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, 609611 + ... + 631448.

It is an arithmetic number, because the mean of its divisors is an integer number (1731278700).

Almost surely, 2^13551123221 is an apocalyptic number.

It is an amenable number.

13551123221 is a deficient number, since it is larger than the sum of its proper divisors (299106379).

13551123221 is a wasteful number, since it uses less digits than its factorization.

13551123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241299.

The product of its digits is 1800, while the sum is 26.

Adding to 13551123221 its reverse (12232115531), we get a palindrome (25783238752).

The spelling of 13551123221 in words is "thirteen billion, five hundred fifty-one million, one hundred twenty-three thousand, two hundred twenty-one".