1123220221 has 2 divisors, whose sum is σ = 1123220222. Its totient is φ = 1123220220.

The previous prime is 1123220201. The next prime is 1123220239. The reversal of 1123220221 is 1220223211.

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., 1044259225 + 78960996 = 32315^2 + 8886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123220221 - 2¹³ = 1123212029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1123220195 and 1123220204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123220201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561610110 + 561610111.

It is an arithmetic number, because the mean of its divisors is an integer number (561610111).

Almost surely, 2^1123220221 is an apocalyptic number.

It is an amenable number.

1123220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123220221 is an equidigital number, since it uses as much as digits as its factorization.

1123220221 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 1123220221 is about 33514.4777819974. The cubic root of 1123220221 is about 1039.4931643421.

Adding to 1123220221 its reverse (1220223211), we get a palindrome (2343443432).

The spelling of 1123220221 in words is "one billion, one hundred twenty-three million, two hundred twenty thousand, two hundred twenty-one".