220221012222221 has 2 divisors, whose sum is σ = 220221012222222. Its totient is φ = 220221012222220.

The previous prime is 220221012222199. The next prime is 220221012222247. The reversal of 220221012222221 is 122222210122022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214438242564100 + 5782769658121 = 14643710^2 + 2404739^2 .

It is a cyclic number.

It is not a de Polignac number, because 220221012222221 - 2⁴² = 215822965711117 is a prime.

It is a super-2 number, since 2×220221012222221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220221012252221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110110506111110 + 110110506111111.

It is an arithmetic number, because the mean of its divisors is an integer number (110110506111111).

Almost surely, 2^{220221012222221} is an apocalyptic number.

It is an amenable number.

220221012222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220221012222221 is an equidigital number, since it uses as much as digits as its factorization.

220221012222221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 220221012222221 its reverse (122222210122022), we get a palindrome (342443222344243).

The spelling of 220221012222221 in words is "two hundred twenty trillion, two hundred twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".