221541223122 has 64 divisors (see below), whose sum is σ = 495388320000. Its totient is φ = 73386808704.

The previous prime is 221541223063. The next prime is 221541223133. The reversal of 221541223122 is 221322145122.

221541223122 is a `hidden beast` number, since 2 + 2 + 15 + 412 + 231 + 2 + 2 = 666.

221541223122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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, 9154254 + ... + 9178422.

It is an arithmetic number, because the mean of its divisors is an integer number (7740442500).

Almost surely, 2^221541223122 is an apocalyptic number.

221541223122 is an abundant number, since it is smaller than the sum of its proper divisors (273847096878).

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

221541223122 is a wasteful number, since it uses less digits than its factorization.

221541223122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25232 (or 25226 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

Adding to 221541223122 its reverse (221322145122), we get a palindrome (442863368244).

The spelling of 221541223122 in words is "two hundred twenty-one billion, five hundred forty-one million, two hundred twenty-three thousand, one hundred twenty-two".