221630445506 has 8 divisors (see below), whose sum is σ = 332623167564. Its totient is φ = 110756056320.

The previous prime is 221630445503. The next prime is 221630445571. The reversal of 221630445506 is 605544036122.

221630445506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 164301326281 + 57329119225 = 405341^2 + 239435^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221630445506.

It is not an unprimeable number, because it can be changed into a prime (221630445503) 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 3 ways as a sum of consecutive naturals, for example, 29578535 + ... + 29586026.

Almost surely, 2^221630445506 is an apocalyptic number.

221630445506 is a deficient number, since it is larger than the sum of its proper divisors (110992722058).

221630445506 is a wasteful number, since it uses less digits than its factorization.

221630445506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59166436.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 221630445506 in words is "two hundred twenty-one billion, six hundred thirty million, four hundred forty-five thousand, five hundred six".