13755221 has 4 divisors (see below), whose sum is σ = 14479200. Its totient is φ = 13031244.

The previous prime is 13755199. The next prime is 13755223. The reversal of 13755221 is 12255731.

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 a cyclic number.

It is not a de Polignac number, because 13755221 - 2¹⁰ = 13754197 is a prime.

It is a super-2 number, since 2×13755221² = 378412209517682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13755223) 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, 361961 + ... + 361998.

It is an arithmetic number, because the mean of its divisors is an integer number (3619800).

Almost surely, 2^13755221 is an apocalyptic number.

It is an amenable number.

13755221 is a deficient number, since it is larger than the sum of its proper divisors (723979).

13755221 is an equidigital number, since it uses as much as digits as its factorization.

13755221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723978.

The product of its digits is 2100, while the sum is 26.

The square root of 13755221 is about 3708.8031762281. The cubic root of 13755221 is about 239.6013114440.

The spelling of 13755221 in words is "thirteen million, seven hundred fifty-five thousand, two hundred twenty-one".