23390221 has 2 divisors, whose sum is σ = 23390222. Its totient is φ = 23390220.

The previous prime is 23390183. The next prime is 23390239. The reversal of 23390221 is 12209332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 12996 = 4835^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 23390221 - 2¹⁷ = 23259149 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23390192 and 23390201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23390291) 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 as a sum of consecutive naturals, namely, 11695110 + 11695111.

It is an arithmetic number, because the mean of its divisors is an integer number (11695111).

Almost surely, 2^23390221 is an apocalyptic number.

It is an amenable number.

23390221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23390221 is an equidigital number, since it uses as much as digits as its factorization.

23390221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 23390221 is about 4836.3437636297. The cubic root of 23390221 is about 285.9860010753.

Adding to 23390221 its reverse (12209332), we get a palindrome (35599553).

The spelling of 23390221 in words is "twenty-three million, three hundred ninety thousand, two hundred twenty-one".