23223221 has 4 divisors (see below), whose sum is σ = 26540832. Its totient is φ = 19905612.

The previous prime is 23223209. The next prime is 23223223. The reversal of 23223221 is 12232232.

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 23223221 - 2⁶ = 23223157 is a prime.

It is a super-2 number, since 2×23223221² = 1078635987229682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23223221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23223223) 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, 1658795 + ... + 1658808.

It is an arithmetic number, because the mean of its divisors is an integer number (6635208).

Almost surely, 2^23223221 is an apocalyptic number.

It is an amenable number.

23223221 is a deficient number, since it is larger than the sum of its proper divisors (3317611).

23223221 is an equidigital number, since it uses as much as digits as its factorization.

23223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317610.

The product of its digits is 288, while the sum is 17.

The square root of 23223221 is about 4819.0477275080. The cubic root of 23223221 is about 285.3037532964.

Adding to 23223221 its reverse (12232232), we get a palindrome (35455453).

It can be divided in two parts, 2 and 3223221, that added together give a palindrome (3223223).

The spelling of 23223221 in words is "twenty-three million, two hundred twenty-three thousand, two hundred twenty-one".