220021112221 has 2 divisors, whose sum is σ = 220021112222. Its totient is φ = 220021112220.

The previous prime is 220021112197. The next prime is 220021112237. The reversal of 220021112221 is 122211120022.

It is a happy number.

It is an a-pointer prime, because the next prime (220021112237) can be obtained adding 220021112221 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181634506596 + 38386605625 = 426186^2 + 195925^2 .

It is a cyclic number.

It is not a de Polignac number, because 220021112221 - 2⁷ = 220021112093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220021112195 and 220021112204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220021116221) by changing a digit.

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 as a sum of consecutive naturals, namely, 110010556110 + 110010556111.

It is an arithmetic number, because the mean of its divisors is an integer number (110010556111).

Almost surely, 2^220021112221 is an apocalyptic number.

It is an amenable number.

220021112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220021112221 is an equidigital number, since it uses as much as digits as its factorization.

220021112221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 220021112221 its reverse (122211120022), we get a palindrome (342232232243).

The spelling of 220021112221 in words is "two hundred twenty billion, twenty-one million, one hundred twelve thousand, two hundred twenty-one".