12121578782 has 32 divisors (see below), whose sum is σ = 19405267200. Its totient is φ = 5658968448.

The previous prime is 12121578773. The next prime is 12121578787. The reversal of 12121578782 is 28787512121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121578787) 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, 3650519 + ... + 3653837.

It is an arithmetic number, because the mean of its divisors is an integer number (606414600).

Almost surely, 2^12121578782 is an apocalyptic number.

12121578782 is a deficient number, since it is larger than the sum of its proper divisors (7283688418).

12121578782 is a wasteful number, since it uses less digits than its factorization.

12121578782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160.

The product of its digits is 125440, while the sum is 44.

The spelling of 12121578782 in words is "twelve billion, one hundred twenty-one million, five hundred seventy-eight thousand, seven hundred eighty-two".