220021313221 has 4 divisors (see below), whose sum is σ = 220586921100. Its totient is φ = 219455705344.

The previous prime is 220021313209. The next prime is 220021313251. The reversal of 220021313221 is 122313120022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122313120022 = 2 ⋅61156560011.

It can be written as a sum of positive squares in 2 ways, for example, as 44200437121 + 175820876100 = 210239^2 + 419310^2 .

It is a cyclic number.

It is not a de Polignac number, because 220021313221 - 2³³ = 211431378629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021313201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282803356 + ... + 282804133.

It is an arithmetic number, because the mean of its divisors is an integer number (55146730275).

Almost surely, 2^220021313221 is an apocalyptic number.

It is an amenable number.

220021313221 is a deficient number, since it is larger than the sum of its proper divisors (565607879).

220021313221 is an equidigital number, since it uses as much as digits as its factorization.

220021313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565607878.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 220021313221 its reverse (122313120022), we get a palindrome (342334433243).

The spelling of 220021313221 in words is "two hundred twenty billion, twenty-one million, three hundred thirteen thousand, two hundred twenty-one".