123321220 has 24 divisors (see below), whose sum is σ = 282518208. Its totient is φ = 44844000.

The previous prime is 123321203. The next prime is 123321223. The reversal of 123321220 is 22123321.

It is a junction number, because it is equal to n+sod(n) for n = 123321194 and 123321203.

It is not an unprimeable number, because it can be changed into a prime (123321223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280056 + ... + 280495.

It is an arithmetic number, because the mean of its divisors is an integer number (11771592).

Almost surely, 2^123321220 is an apocalyptic number.

123321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123321220 is an abundant number, since it is smaller than the sum of its proper divisors (159196988).

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

123321220 is a wasteful number, since it uses less digits than its factorization.

123321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560571 (or 560569 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 123321220 is about 11105.0087798254. The cubic root of 123321220 is about 497.7515305939.

Adding to 123321220 its reverse (22123321), we get a palindrome (145444541).

The spelling of 123321220 in words is "one hundred twenty-three million, three hundred twenty-one thousand, two hundred twenty".