12123321978 has 8 divisors (see below), whose sum is σ = 24246643968. Its totient is φ = 4041107324.

The previous prime is 12123321971. The next prime is 12123321983. The reversal of 12123321978 is 87912332121.

It is a sphenic number, since it is the product of 3 distinct primes.

12123321978 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12123321971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010276826 + ... + 1010276837.

It is an arithmetic number, because the mean of its divisors is an integer number (3030830496).

Almost surely, 2^12123321978 is an apocalyptic number.

12123321978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12123321978 is a wasteful number, since it uses less digits than its factorization.

12123321978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020553668.

The product of its digits is 36288, while the sum is 39.

The spelling of 12123321978 in words is "twelve billion, one hundred twenty-three million, three hundred twenty-one thousand, nine hundred seventy-eight".