221326275444 has 12 divisors (see below), whose sum is σ = 516427976064. Its totient is φ = 73775425144.

The previous prime is 221326275439. The next prime is 221326275487. The reversal of 221326275444 is 444572623122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 221326275396 and 221326275405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9221928132 + ... + 9221928155.

It is an arithmetic number, because the mean of its divisors is an integer number (43035664672).

Almost surely, 2^221326275444 is an apocalyptic number.

It is an amenable number.

221326275444 is an abundant number, since it is smaller than the sum of its proper divisors (295101700620).

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

221326275444 is a wasteful number, since it uses less digits than its factorization.

221326275444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18443856294 (or 18443856292 counting only the distinct ones).

The product of its digits is 645120, while the sum is 42.

Adding to 221326275444 its reverse (444572623122), we get a palindrome (665898898566).

The spelling of 221326275444 in words is "two hundred twenty-one billion, three hundred twenty-six million, two hundred seventy-five thousand, four hundred forty-four".