221644612530 has 48 divisors (see below), whose sum is σ = 628664721984. Its totient is φ = 53732027040.

The previous prime is 221644612523. The next prime is 221644612547. The reversal of 221644612530 is 35216446122.

221644612530 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 4 + 4 + 612 + 5 + 30 = 666.

221644612530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 23 ways as a sum of consecutive naturals, for example, 111940734 + ... + 111942713.

It is an arithmetic number, because the mean of its divisors is an integer number (13097181708).

Almost surely, 2^221644612530 is an apocalyptic number.

221644612530 is an abundant number, since it is smaller than the sum of its proper divisors (407020109454).

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

221644612530 is a wasteful number, since it uses less digits than its factorization.

221644612530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223883471 (or 223883468 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 221644612530 in words is "two hundred twenty-one billion, six hundred forty-four million, six hundred twelve thousand, five hundred thirty".