220223121221 has 2 divisors, whose sum is σ = 220223121222. Its totient is φ = 220223121220.

The previous prime is 220223121179. The next prime is 220223121247. The reversal of 220223121221 is 122121322022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199015024321 + 21208096900 = 446111^2 + 145630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220223121221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220223121193 and 220223121202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220223121271) 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 as a sum of consecutive naturals, namely, 110111560610 + 110111560611.

It is an arithmetic number, because the mean of its divisors is an integer number (110111560611).

Almost surely, 2^220223121221 is an apocalyptic number.

It is an amenable number.

220223121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220223121221 is an equidigital number, since it uses as much as digits as its factorization.

220223121221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 220223121221 its reverse (122121322022), we get a palindrome (342344443243).

The spelling of 220223121221 in words is "two hundred twenty billion, two hundred twenty-three million, one hundred twenty-one thousand, two hundred twenty-one".