1220221022021 has 2 divisors, whose sum is σ = 1220221022022. Its totient is φ = 1220221022020.

The previous prime is 1220221022011. The next prime is 1220221022023. The reversal of 1220221022021 is 1202201220221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687556056100 + 532664965921 = 829190^2 + 729839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220221022021 is a prime.

Together with 1220221022023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220221022023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610110511010 + 610110511011.

It is an arithmetic number, because the mean of its divisors is an integer number (610110511011).

Almost surely, 2^{1220221022021} is an apocalyptic number.

It is an amenable number.

1220221022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220221022021 is an equidigital number, since it uses as much as digits as its factorization.

1220221022021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1220221022021 its reverse (1202201220221), we get a palindrome (2422422242242).

The spelling of 1220221022021 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, twenty-two thousand, twenty-one".