233221220 has 12 divisors (see below), whose sum is σ = 489764604. Its totient is φ = 93288480.

The previous prime is 233221189. The next prime is 233221237. The reversal of 233221220 is 22122332.

It can be written as a sum of positive squares in 2 ways, for example, as 52157284 + 181063936 = 7222^2 + 13456^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5830511 + ... + 5830550.

It is an arithmetic number, because the mean of its divisors is an integer number (40813717).

Almost surely, 2^233221220 is an apocalyptic number.

233221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

233221220 is an abundant number, since it is smaller than the sum of its proper divisors (256543384).

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

233221220 is a wasteful number, since it uses less digits than its factorization.

233221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11661070 (or 11661068 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 233221220 is about 15271.5821053354. The cubic root of 233221220 is about 615.5396325580.

Adding to 233221220 its reverse (22122332), we get a palindrome (255343552).

It can be divided in two parts, 23322 and 1220, that added together give a palindrome (24542).

The spelling of 233221220 in words is "two hundred thirty-three million, two hundred twenty-one thousand, two hundred twenty".