221320132221 has 16 divisors (see below), whose sum is σ = 295957584000. Its totient is φ = 147114835968.

The previous prime is 221320132177. The next prime is 221320132259. The reversal of 221320132221 is 122231023122.

It is not a de Polignac number, because 221320132221 - 2⁶ = 221320132157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221320132291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12675105 + ... + 12692553.

It is an arithmetic number, because the mean of its divisors is an integer number (18497349000).

Almost surely, 2^221320132221 is an apocalyptic number.

It is an amenable number.

221320132221 is a deficient number, since it is larger than the sum of its proper divisors (74637451779).

221320132221 is a wasteful number, since it uses less digits than its factorization.

221320132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29588.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221320132221 its reverse (122231023122), we get a palindrome (343551155343).

It can be divided in two parts, 2213201 and 32221, that added together give a palindrome (2245422).

The spelling of 221320132221 in words is "two hundred twenty-one billion, three hundred twenty million, one hundred thirty-two thousand, two hundred twenty-one".