1216824885920 has 48 divisors (see below), whose sum is σ = 3285427195008. Its totient is φ = 417197103360.

The previous prime is 1216824885917. The next prime is 1216824885943. The reversal of 1216824885920 is 295884286121.

It is a Harshad number since it is a multiple of its sum of digits (56).

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, 543224276 + ... + 543226515.

It is an arithmetic number, because the mean of its divisors is an integer number (68446399896).

Almost surely, 2^{1216824885920} is an apocalyptic number.

1216824885920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216824885920 is an abundant number, since it is smaller than the sum of its proper divisors (2068602309088).

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

1216824885920 is a wasteful number, since it uses less digits than its factorization.

1216824885920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086450813 (or 1086450805 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 56.

The spelling of 1216824885920 in words is "one trillion, two hundred sixteen billion, eight hundred twenty-four million, eight hundred eighty-five thousand, nine hundred twenty".