221112640644 has 48 divisors (see below), whose sum is σ = 589661606016. Its totient is φ = 63172051200.

The previous prime is 221112640571. The next prime is 221112640649. The reversal of 221112640644 is 446046211122.

221112640644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221112640649) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2217624 + ... + 2315184.

It is an arithmetic number, because the mean of its divisors is an integer number (12284616792).

Almost surely, 2^221112640644 is an apocalyptic number.

It is an amenable number.

221112640644 is an abundant number, since it is smaller than the sum of its proper divisors (368548965372).

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

221112640644 is a wasteful number, since it uses less digits than its factorization.

221112640644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124556 (or 124554 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

Adding to 221112640644 its reverse (446046211122), we get a palindrome (667158851766).

The spelling of 221112640644 in words is "two hundred twenty-one billion, one hundred twelve million, six hundred forty thousand, six hundred forty-four".