221220030321 has 12 divisors (see below), whose sum is σ = 319611221748. Its totient is φ = 147447168864.

The previous prime is 221220030313. The next prime is 221220030323. The reversal of 221220030321 is 123030022122.

It can be written as a sum of positive squares in 2 ways, for example, as 220464055296 + 755975025 = 469536^2 + 27495^2 .

It is not a de Polignac number, because 221220030321 - 2³ = 221220030313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221220030294 and 221220030303.

It is not an unprimeable number, because it can be changed into a prime (221220030323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2694930 + ... + 2775803.

It is an arithmetic number, because the mean of its divisors is an integer number (26634268479).

Almost surely, 2^221220030321 is an apocalyptic number.

It is an amenable number.

221220030321 is a deficient number, since it is larger than the sum of its proper divisors (98391191427).

221220030321 is a wasteful number, since it uses less digits than its factorization.

221220030321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5475232 (or 5475229 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 221220030321 its reverse (123030022122), we get a palindrome (344250052443).

The spelling of 221220030321 in words is "two hundred twenty-one billion, two hundred twenty million, thirty thousand, three hundred twenty-one".