1012220320021 has 2 divisors, whose sum is σ = 1012220320022. Its totient is φ = 1012220320020.

The previous prime is 1012220320003. The next prime is 1012220320061. The reversal of 1012220320021 is 1200230222101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1012215075921 + 5244100 = 1006089^2 + 2290^2 .

It is an emirp because it is prime and its reverse (1200230222101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1012220320021 - 2⁷ = 1012220319893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1012220319977 and 1012220320004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012220320061) 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, 506110160010 + 506110160011.

It is an arithmetic number, because the mean of its divisors is an integer number (506110160011).

Almost surely, 2^{1012220320021} is an apocalyptic number.

It is an amenable number.

1012220320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012220320021 is an equidigital number, since it uses as much as digits as its factorization.

1012220320021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 1012220320021 its reverse (1200230222101), we get a palindrome (2212450542122).

The spelling of 1012220320021 in words is "one trillion, twelve billion, two hundred twenty million, three hundred twenty thousand, twenty-one".