220031302221 has 6 divisors (see below), whose sum is σ = 317822992110. Its totient is φ = 146687534808.

The previous prime is 220031302217. The next prime is 220031302241. The reversal of 220031302221 is 122203130022.

It can be written as a sum of positive squares in only one way, i.e., 145767422025 + 74263880196 = 381795^2 + 272514^2 .

It is not a de Polignac number, because 220031302221 - 2² = 220031302217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220031302194 and 220031302203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220031302241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12223961226 + ... + 12223961243.

It is an arithmetic number, because the mean of its divisors is an integer number (52970498685).

Almost surely, 2^220031302221 is an apocalyptic number.

It is an amenable number.

220031302221 is a deficient number, since it is larger than the sum of its proper divisors (97791689889).

220031302221 is a wasteful number, since it uses less digits than its factorization.

220031302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24447922475 (or 24447922472 counting only the distinct ones).

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

Adding to 220031302221 its reverse (122203130022), we get a palindrome (342234432243).

The spelling of 220031302221 in words is "two hundred twenty billion, thirty-one million, three hundred two thousand, two hundred twenty-one".