221490504544 has 72 divisors (see below), whose sum is σ = 464688478800. Its totient is φ = 103897389312.

The previous prime is 221490504527. The next prime is 221490504559. The reversal of 221490504544 is 445405094122.

221490504544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221490504497 and 221490504506.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1096782 + ... + 1282930.

It is an arithmetic number, because the mean of its divisors is an integer number (6454006650).

Almost surely, 2^221490504544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221490504544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232344239400).

221490504544 is an abundant number, since it is smaller than the sum of its proper divisors (243197974256).

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

221490504544 is a wasteful number, since it uses less digits than its factorization.

221490504544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186300 (or 186273 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

Adding to 221490504544 its reverse (445405094122), we get a palindrome (666895598666).

The spelling of 221490504544 in words is "two hundred twenty-one billion, four hundred ninety million, five hundred four thousand, five hundred forty-four".