1223210221 has 2 divisors, whose sum is σ = 1223210222. Its totient is φ = 1223210220.

The previous prime is 1223210189. The next prime is 1223210249. The reversal of 1223210221 is 1220123221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 743162121 + 480048100 = 27261^2 + 21910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223210221 - 2⁵ = 1223210189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1223210195 and 1223210204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223210281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611605110 + 611605111.

It is an arithmetic number, because the mean of its divisors is an integer number (611605111).

Almost surely, 2^1223210221 is an apocalyptic number.

It is an amenable number.

1223210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223210221 is an equidigital number, since it uses as much as digits as its factorization.

1223210221 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 16.

The square root of 1223210221 is about 34974.4223826499. The cubic root of 1223210221 is about 1069.4661269504.

Adding to 1223210221 its reverse (1220123221), we get a palindrome (2443333442).

The spelling of 1223210221 in words is "one billion, two hundred twenty-three million, two hundred ten thousand, two hundred twenty-one".