1212104320 has 128 divisors (see below), whose sum is σ = 3392928000. Its totient is φ = 405381120.

The previous prime is 1212104287. The next prime is 1212104323. The reversal of 1212104320 is 234012121.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1212104294 and 1212104303.

It is not an unprimeable number, because it can be changed into a prime (1212104323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180381 + ... + 186979.

It is an arithmetic number, because the mean of its divisors is an integer number (26507250).

Almost surely, 2^1212104320 is an apocalyptic number.

1212104320 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 1212104320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1696464000).

1212104320 is an abundant number, since it is smaller than the sum of its proper divisors (2180823680).

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

1212104320 is an equidigital number, since it uses as much as digits as its factorization.

1212104320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6666 (or 6654 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1212104320 is about 34815.2885956730. The cubic root of 1212104320 is about 1066.2196112699.

Adding to 1212104320 its reverse (234012121), we get a palindrome (1446116441).

The spelling of 1212104320 in words is "one billion, two hundred twelve million, one hundred four thousand, three hundred twenty".