221230323220 has 12 divisors (see below), whose sum is σ = 464583678804. Its totient is φ = 88492129280.

The previous prime is 221230323217. The next prime is 221230323221. The reversal of 221230323220 is 22323032122.

It can be written as a sum of positive squares in 2 ways, for example, as 154089221764 + 67141101456 = 392542^2 + 259116^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221230323191 and 221230323200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221230323221) 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 3 ways as a sum of consecutive naturals, for example, 5530758061 + ... + 5530758100.

It is an arithmetic number, because the mean of its divisors is an integer number (38715306567).

Almost surely, 2^221230323220 is an apocalyptic number.

221230323220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221230323220 is an abundant number, since it is smaller than the sum of its proper divisors (243353355584).

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

221230323220 is a wasteful number, since it uses less digits than its factorization.

221230323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11061516170 (or 11061516168 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 221230323220 its reverse (22323032122), we get a palindrome (243553355342).

The spelling of 221230323220 in words is "two hundred twenty-one billion, two hundred thirty million, three hundred twenty-three thousand, two hundred twenty".