1212223320 has 640 divisors, whose sum is σ = 5243927040. Its totient is φ = 243855360.

The previous prime is 1212223297. The next prime is 1212223361. The reversal of 1212223320 is 233222121.

1212223320 is a `hidden beast` number, since 121 + 2 + 223 + 320 = 666.

It is a super-3 number, since 3×1212223320³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1212223293 and 1212223302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 10727584 + ... + 10727696.

It is an arithmetic number, because the mean of its divisors is an integer number (8193636).

Almost surely, 2^1212223320 is an apocalyptic number.

1212223320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212223320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2621963520).

1212223320 is an abundant number, since it is smaller than the sum of its proper divisors (4031703720).

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

1212223320 is a wasteful number, since it uses less digits than its factorization.

1212223320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1212223320 is about 34816.9975730246. The cubic root of 1212223320 is about 1066.2545026511.

Adding to 1212223320 its reverse (233222121), we get a palindrome (1445445441).

The spelling of 1212223320 in words is "one billion, two hundred twelve million, two hundred twenty-three thousand, three hundred twenty".