1220221700221 has 2 divisors, whose sum is σ = 1220221700222. Its totient is φ = 1220221700220.

The previous prime is 1220221700219. The next prime is 1220221700233. The reversal of 1220221700221 is 1220071220221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1174754667321 + 45467032900 = 1083861^2 + 213230^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220221700221 - 2¹ = 1220221700219 is a prime.

Together with 1220221700219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1220221700192 and 1220221700201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220224700221) 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, 610110850110 + 610110850111.

It is an arithmetic number, because the mean of its divisors is an integer number (610110850111).

Almost surely, 2^{1220221700221} is an apocalyptic number.

It is an amenable number.

1220221700221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220221700221 is an equidigital number, since it uses as much as digits as its factorization.

1220221700221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 1220221700221 its reverse (1220071220221), we get a palindrome (2440292920442).

The spelling of 1220221700221 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, seven hundred thousand, two hundred twenty-one".