23220221 has 2 divisors, whose sum is σ = 23220222. Its totient is φ = 23220220.

The previous prime is 23220187. The next prime is 23220229. The reversal of 23220221 is 12202232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22562500 + 657721 = 4750^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 23220221 - 2¹⁴ = 23203837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23220196 and 23220205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23220229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11610110 + 11610111.

It is an arithmetic number, because the mean of its divisors is an integer number (11610111).

Almost surely, 2^23220221 is an apocalyptic number.

It is an amenable number.

23220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23220221 is an equidigital number, since it uses as much as digits as its factorization.

23220221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 23220221 is about 4818.7364526398. The cubic root of 23220221 is about 285.2914674881.

Adding to 23220221 its reverse (12202232), we get a palindrome (35422453).

It can be divided in two parts, 2 and 3220221, that added together give a palindrome (3220223).

The spelling of 23220221 in words is "twenty-three million, two hundred twenty thousand, two hundred twenty-one".