1123223221 has 2 divisors, whose sum is σ = 1123223222. Its totient is φ = 1123223220.

The previous prime is 1123223197. The next prime is 1123223251. The reversal of 1123223221 is 1223223211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 960380100 + 162843121 = 30990^2 + 12761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123223221 - 2¹⁹ = 1122698933 is a prime.

It is a super-2 number, since 2×1123223221² = 2523260808387229682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123223251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561611610 + 561611611.

It is an arithmetic number, because the mean of its divisors is an integer number (561611611).

Almost surely, 2^1123223221 is an apocalyptic number.

It is an amenable number.

1123223221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123223221 is an equidigital number, since it uses as much as digits as its factorization.

1123223221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 19.

The square root of 1123223221 is about 33514.5225387443. The cubic root of 1123223221 is about 1039.4940897993.

Adding to 1123223221 its reverse (1223223211), we get a palindrome (2346446432).

It can be divided in two parts, 11232 and 23221, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 1123223221 in words is "one billion, one hundred twenty-three million, two hundred twenty-three thousand, two hundred twenty-one".