2221112221878 has 32 divisors (see below), whose sum is σ = 4853917353600. Its totient is φ = 671973431360.

The previous prime is 2221112221877. The next prime is 2221112221931. The reversal of 2221112221878 is 8781222111222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221112221877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27230928 + ... + 27312371.

It is an arithmetic number, because the mean of its divisors is an integer number (151684917300).

Almost surely, 2^{2221112221878} is an apocalyptic number.

2221112221878 is an abundant number, since it is smaller than the sum of its proper divisors (2632805131722).

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

2221112221878 is a wasteful number, since it uses less digits than its factorization.

2221112221878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54543932.

The product of its digits is 28672, while the sum is 39.

The spelling of 2221112221878 in words is "two trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, eight hundred seventy-eight".