12221000178 has 32 divisors (see below), whose sum is σ = 24873331392. Its totient is φ = 4002321600.

The previous prime is 12221000111. The next prime is 12221000179. The reversal of 12221000178 is 87100012221.

It is not an unprimeable number, because it can be changed into a prime (12221000179) 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 15 ways as a sum of consecutive naturals, for example, 22348 + ... + 157928.

It is an arithmetic number, because the mean of its divisors is an integer number (777291606).

Almost surely, 2^12221000178 is an apocalyptic number.

12221000178 is an abundant number, since it is smaller than the sum of its proper divisors (12652331214).

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

12221000178 is a wasteful number, since it uses less digits than its factorization.

12221000178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135850.

The product of its (nonzero) digits is 448, while the sum is 24.

Adding to 12221000178 its reverse (87100012221), we get a palindrome (99321012399).

The spelling of 12221000178 in words is "twelve billion, two hundred twenty-one million, one hundred seventy-eight", and thus it is an aban number.