221221233220044 has 48 divisors (see below), whose sum is σ = 542056347802368. Its totient is φ = 70085043133248.

The previous prime is 221221233220033. The next prime is 221221233220073. The reversal of 221221233220044 is 440022332122122.

It is a junction number, because it is equal to n+sod(n) for n = 221221233219993 and 221221233220020.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2552587902 + ... + 2552674565.

It is an arithmetic number, because the mean of its divisors is an integer number (11292840579216).

Almost surely, 2^{221221233220044} is an apocalyptic number.

It is an amenable number.

221221233220044 is an abundant number, since it is smaller than the sum of its proper divisors (320835114582324).

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

221221233220044 is a wasteful number, since it uses less digits than its factorization.

221221233220044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105262654 (or 5105262652 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 221221233220044 its reverse (440022332122122), we get a palindrome (661243565342166).

The spelling of 221221233220044 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred thirty-three million, two hundred twenty thousand, forty-four".