1212320000 has 90 divisors (see below), whose sum is σ = 3024311598. Its totient is φ = 484864000.

The previous prime is 1212319993. The next prime is 1212320033. The reversal of 1212320000 is 232121.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 889470976 + 322849024 = 29824^2 + 17968^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 156212 + ... + 163788.

Almost surely, 2^1212320000 is an apocalyptic number.

1212320000 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 1212320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1512155799).

1212320000 is an abundant number, since it is smaller than the sum of its proper divisors (1811991598).

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

1212320000 is an frugal number, since it uses more digits than its factorization.

1212320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7613 (or 7584 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1212320000 is about 34818.3859476570. The cubic root of 1212320000 is about 1066.2828480182.

Adding to 1212320000 its reverse (232121), we get a palindrome (1212552121).

It can be divided in two parts, 12123 and 20000, that added together give a palindrome (32123).

The spelling of 1212320000 in words is "one billion, two hundred twelve million, three hundred twenty thousand".