12221028078 has 64 divisors (see below), whose sum is σ = 28811040768. Its totient is φ = 3383539200.

The previous prime is 12221028049. The next prime is 12221028091. The reversal of 12221028078 is 87082012221.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 168726 + ... + 230022.

It is an arithmetic number, because the mean of its divisors is an integer number (450172512).

Almost surely, 2^12221028078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12221028078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14405520384).

12221028078 is an abundant number, since it is smaller than the sum of its proper divisors (16590012690).

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

12221028078 is a wasteful number, since it uses less digits than its factorization.

12221028078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61457.

The product of its (nonzero) digits is 7168, while the sum is 33.

The spelling of 12221028078 in words is "twelve billion, two hundred twenty-one million, twenty-eight thousand, seventy-eight".