1220212224221 has 2 divisors, whose sum is σ = 1220212224222. Its totient is φ = 1220212224220.

The previous prime is 1220212224151. The next prime is 1220212224281. The reversal of 1220212224221 is 1224222120221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 917018827321 + 303193396900 = 957611^2 + 550630^2 .

It is an emirp because it is prime and its reverse (1224222120221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220212224221 - 2³⁴ = 1203032355037 is a prime.

It is a super-3 number, since 3×1220212224221³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220212224281) 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, 610106112110 + 610106112111.

It is an arithmetic number, because the mean of its divisors is an integer number (610106112111).

Almost surely, 2^{1220212224221} is an apocalyptic number.

It is an amenable number.

1220212224221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220212224221 is an equidigital number, since it uses as much as digits as its factorization.

1220212224221 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 1220212224221 its reverse (1224222120221), we get a palindrome (2444434344442).

The spelling of 1220212224221 in words is "one trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty-four thousand, two hundred twenty-one".