13773221 has 8 divisors (see below), whose sum is σ = 17171904. Its totient is φ = 10732320.

The previous prime is 13773211. The next prime is 13773229. The reversal of 13773221 is 12237731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13773221 - 2¹⁴ = 13756837 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 (13773229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89360 + ... + 89513.

It is an arithmetic number, because the mean of its divisors is an integer number (2146488).

Almost surely, 2^13773221 is an apocalyptic number.

13773221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13773221 is a deficient number, since it is larger than the sum of its proper divisors (3398683).

13773221 is a wasteful number, since it uses less digits than its factorization.

13773221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178891.

The product of its digits is 1764, while the sum is 26.

The square root of 13773221 is about 3711.2290417057. The cubic root of 13773221 is about 239.7057795033.

The spelling of 13773221 in words is "thirteen million, seven hundred seventy-three thousand, two hundred twenty-one".