1133221220 has 12 divisors (see below), whose sum is σ = 2379764604. Its totient is φ = 453288480.

The previous prime is 1133221211. The next prime is 1133221223. The reversal of 1133221220 is 221223311.

It can be written as a sum of positive squares in 2 ways, for example, as 640292416 + 492928804 = 25304^2 + 22202^2 .

It is not an unprimeable number, because it can be changed into a prime (1133221223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28330511 + ... + 28330550.

It is an arithmetic number, because the mean of its divisors is an integer number (198313717).

Almost surely, 2^1133221220 is an apocalyptic number.

1133221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1133221220 is an abundant number, since it is smaller than the sum of its proper divisors (1246543384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1133221220 is a wasteful number, since it uses less digits than its factorization.

1133221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56661070 (or 56661068 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1133221220 is about 33663.3512889017. The cubic root of 1133221220 is about 1042.5692209825.

Adding to 1133221220 its reverse (221223311), we get a palindrome (1354444531).

The spelling of 1133221220 in words is "one billion, one hundred thirty-three million, two hundred twenty-one thousand, two hundred twenty".