1213220322 has 64 divisors (see below), whose sum is σ = 2765293440. Its totient is φ = 394149888.

The previous prime is 1213220303. The next prime is 1213220339. The reversal of 1213220322 is 2230223121.

1213220322 is a `hidden beast` number, since 1 + 21 + 322 + 0 + 322 = 666.

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 = 1213220295 and 1213220304.

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 31 ways as a sum of consecutive naturals, for example, 349218 + ... + 352674.

It is an arithmetic number, because the mean of its divisors is an integer number (43207710).

Almost surely, 2^1213220322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213220322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1382646720).

1213220322 is an abundant number, since it is smaller than the sum of its proper divisors (1552073118).

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

1213220322 is a wasteful number, since it uses less digits than its factorization.

1213220322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632 (or 3626 counting only the distinct ones).

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

The square root of 1213220322 is about 34831.3123783759. The cubic root of 1213220322 is about 1066.5467388388.

Adding to 1213220322 its reverse (2230223121), we get a palindrome (3443443443).

The spelling of 1213220322 in words is "one billion, two hundred thirteen million, two hundred twenty thousand, three hundred twenty-two".