221323132220 has 12 divisors (see below), whose sum is σ = 464778577704. Its totient is φ = 88529252880.

The previous prime is 221323132213. The next prime is 221323132231. The reversal of 221323132220 is 22231323122.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5533078286 + ... + 5533078325.

It is an arithmetic number, because the mean of its divisors is an integer number (38731548142).

Almost surely, 2^221323132220 is an apocalyptic number.

221323132220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221323132220 is an abundant number, since it is smaller than the sum of its proper divisors (243455445484).

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

221323132220 is a wasteful number, since it uses less digits than its factorization.

221323132220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11066156620 (or 11066156618 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 221323132220 its reverse (22231323122), we get a palindrome (243554455342).

The spelling of 221323132220 in words is "two hundred twenty-one billion, three hundred twenty-three million, one hundred thirty-two thousand, two hundred twenty".