1020220122221 has 2 divisors, whose sum is σ = 1020220122222. Its totient is φ = 1020220122220.

The previous prime is 1020220122199. The next prime is 1020220122227. The reversal of 1020220122221 is 1222210220201.

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., 1018058802121 + 2161320100 = 1008989^2 + 46490^2 .

It is an emirp because it is prime and its reverse (1222210220201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020220122221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020220122221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020220122227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510110061110 + 510110061111.

It is an arithmetic number, because the mean of its divisors is an integer number (510110061111).

Almost surely, 2^{1020220122221} is an apocalyptic number.

It is an amenable number.

1020220122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020220122221 is an equidigital number, since it uses as much as digits as its factorization.

1020220122221 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 1020220122221 its reverse (1222210220201), we get a palindrome (2242430342422).

The spelling of 1020220122221 in words is "one trillion, twenty billion, two hundred twenty million, one hundred twenty-two thousand, two hundred twenty-one".