23303221 has 2 divisors, whose sum is σ = 23303222. Its totient is φ = 23303220.

The previous prime is 23303191. The next prime is 23303237. The reversal of 23303221 is 12230332.

It is an a-pointer prime, because the next prime (23303237) can be obtained adding 23303221 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19018321 + 4284900 = 4361^2 + 2070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23303221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23303195 and 23303204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23303251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11651610 + 11651611.

It is an arithmetic number, because the mean of its divisors is an integer number (11651611).

Almost surely, 2^23303221 is an apocalyptic number.

It is an amenable number.

23303221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23303221 is an equidigital number, since it uses as much as digits as its factorization.

23303221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 23303221 is about 4827.3409865059. The cubic root of 23303221 is about 285.6309852755.

Adding to 23303221 its reverse (12230332), we get a palindrome (35533553).

The spelling of 23303221 in words is "twenty-three million, three hundred three thousand, two hundred twenty-one".