1233333221 has 12 divisors (see below), whose sum is σ = 1311419268. Its totient is φ = 1159660032.

The previous prime is 1233333193. The next prime is 1233333223. The reversal of 1233333221 is 1223333321.

It can be written as a sum of positive squares in 6 ways, for example, as 110145025 + 1123188196 = 10495^2 + 33514^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1233333221 is a prime.

It is a super-2 number, since 2×1233333221² = 3042221668044469682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233333223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 576065 + ... + 578201.

It is an arithmetic number, because the mean of its divisors is an integer number (109284939).

Almost surely, 2^1233333221 is an apocalyptic number.

It is an amenable number.

1233333221 is a deficient number, since it is larger than the sum of its proper divisors (78086047).

1233333221 is a wasteful number, since it uses less digits than its factorization.

1233333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4168 (or 4151 counting only the distinct ones).

The product of its digits is 1944, while the sum is 23.

The square root of 1233333221 is about 35118.8442435112. The cubic root of 1233333221 is about 1072.4082424130.

Adding to 1233333221 its reverse (1223333321), we get a palindrome (2456666542).

It can be divided in two parts, 12333 and 33221, that added together give a palindrome (45554).

The spelling of 1233333221 in words is "one billion, two hundred thirty-three million, three hundred thirty-three thousand, two hundred twenty-one".