13221761 has 8 divisors (see below), whose sum is σ = 15132864. Its totient is φ = 11316240.

The previous prime is 13221749. The next prime is 13221781. The reversal of 13221761 is 16712231.

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 13221761 - 2⁶ = 13221697 is a prime.

It is a super-2 number, since 2×13221761² = 349629927882242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13221781) 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 7 ways as a sum of consecutive naturals, for example, 7391 + ... + 9003.

It is an arithmetic number, because the mean of its divisors is an integer number (1891608).

Almost surely, 2^13221761 is an apocalyptic number.

It is an amenable number.

13221761 is a deficient number, since it is larger than the sum of its proper divisors (1911103).

13221761 is a wasteful number, since it uses less digits than its factorization.

13221761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791.

The product of its digits is 504, while the sum is 23.

The square root of 13221761 is about 3636.1739507345. The cubic root of 13221761 is about 236.4629486331.

Adding to 13221761 its reverse (16712231), we get a palindrome (29933992).

The spelling of 13221761 in words is "thirteen million, two hundred twenty-one thousand, seven hundred sixty-one".