1212112320 has 56 divisors (see below), whose sum is σ = 3848459664. Its totient is φ = 323229696.

The previous prime is 1212112301. The next prime is 1212112331. The reversal of 1212112320 is 232112121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1212112320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630349 + ... + 632268.

It is an arithmetic number, because the mean of its divisors is an integer number (68722494).

Almost surely, 2^1212112320 is an apocalyptic number.

1212112320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212112320 is an abundant number, since it is smaller than the sum of its proper divisors (2636347344).

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

1212112320 is a wasteful number, since it uses less digits than its factorization.

1212112320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262637 (or 1262627 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1212112320 is about 34815.4034875369. The cubic root of 1212112320 is about 1066.2219569806.

Adding to 1212112320 its reverse (232112121), we get a palindrome (1444224441).

The spelling of 1212112320 in words is "one billion, two hundred twelve million, one hundred twelve thousand, three hundred twenty".