221221120194 has 32 divisors (see below), whose sum is σ = 491621880000. Its totient is φ = 73737464832.

The previous prime is 221221120189. The next prime is 221221120199. The reversal of 221221120194 is 491021122122.

It is an interprime number because it is at equal distance from previous prime (221221120189) and next prime (221221120199).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (221221120199) 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, 1635357 + ... + 1765455.

It is an arithmetic number, because the mean of its divisors is an integer number (15363183750).

Almost surely, 2^221221120194 is an apocalyptic number.

221221120194 is an abundant number, since it is smaller than the sum of its proper divisors (270400759806).

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

221221120194 is a wasteful number, since it uses less digits than its factorization.

221221120194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161599 (or 161593 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

It can be divided in two parts, 22122 and 1120194, that added together give a triangular number (1142316 = T₁₅₁₁).

The spelling of 221221120194 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred ninety-four".