1213322320 has 60 divisors (see below), whose sum is σ = 3281552244. Its totient is φ = 415994880.

The previous prime is 1213322293. The next prime is 1213322333. The reversal of 1213322320 is 232233121.

It can be written as a sum of positive squares in 2 ways, for example, as 504271936 + 709050384 = 22456^2 + 26628^2 .

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 11 ways as a sum of consecutive naturals, for example, 150841 + ... + 158680.

Almost surely, 2^1213322320 is an apocalyptic number.

1213322320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213322320 is an abundant number, since it is smaller than the sum of its proper divisors (2068229924).

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

1213322320 is a wasteful number, since it uses less digits than its factorization.

1213322320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309548 (or 309535 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1213322320 is about 34832.7765186756. The cubic root of 1213322320 is about 1066.5766269484.

Adding to 1213322320 its reverse (232233121), we get a palindrome (1445555441).

It can be divided in two parts, 12133 and 22320, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 1213322320 in words is "one billion, two hundred thirteen million, three hundred twenty-two thousand, three hundred twenty".