221332906605 has 32 divisors (see below), whose sum is σ = 360716198400. Its totient is φ = 115858068480.

The previous prime is 221332906603. The next prime is 221332906621. The reversal of 221332906605 is 506609233122.

It is not a de Polignac number, because 221332906605 - 2¹ = 221332906603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221332906603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162421 + ... + 684869.

It is an arithmetic number, because the mean of its divisors is an integer number (11272381200).

Almost surely, 2^221332906605 is an apocalyptic number.

It is an amenable number.

221332906605 is a deficient number, since it is larger than the sum of its proper divisors (139383291795).

221332906605 is a wasteful number, since it uses less digits than its factorization.

221332906605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522981.

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 221332906605 in words is "two hundred twenty-one billion, three hundred thirty-two million, nine hundred six thousand, six hundred five".