1021443220121 has 2 divisors, whose sum is σ = 1021443220122. Its totient is φ = 1021443220120.

The previous prime is 1021443220037. The next prime is 1021443220123. The reversal of 1021443220121 is 1210223441201.

1021443220121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562254026896 + 459189193225 = 749836^2 + 677635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021443220121 is a prime.

Together with 1021443220123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1021443220123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510721610060 + 510721610061.

It is an arithmetic number, because the mean of its divisors is an integer number (510721610061).

Almost surely, 2^{1021443220121} is an apocalyptic number.

It is an amenable number.

1021443220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021443220121 is an equidigital number, since it uses as much as digits as its factorization.

1021443220121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1021443220121 its reverse (1210223441201), we get a palindrome (2231666661322).

The spelling of 1021443220121 in words is "one trillion, twenty-one billion, four hundred forty-three million, two hundred twenty thousand, one hundred twenty-one".