23221 has 4 divisors (see below), whose sum is σ = 25344. Its totient is φ = 21100.

The previous prime is 23209. The next prime is 23227. The reversal of 23221 is 12232.

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 23221 - 2⁵ = 23189 is a prime.

It is a pancake number, because a pancake can be divided into 23221 parts by 215 straight cuts.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 23198 and 23207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1045 + ... + 1066.

It is an arithmetic number, because the mean of its divisors is an integer number (6336).

2²³²²¹ is an apocalyptic number.

It is an amenable number.

23221 is a deficient number, since it is larger than the sum of its proper divisors (2123).

23221 is a wasteful number, since it uses less digits than its factorization.

23221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122.

The product of its digits is 24, while the sum is 10.

The square root of 23221 is about 152.3843824019. The cubic root of 23221 is about 28.5294657805.

Adding to 23221 its reverse (12232), we get a palindrome (35453).

It can be divided in two parts, 232 and 21, that added together give a triangular number (253 = T₂₂).

The spelling of 23221 in words is "twenty-three thousand, two hundred twenty-one", and thus it is an iban number.