20020021221073 has 2 divisors, whose sum is σ = 20020021221074. Its totient is φ = 20020021221072.

The previous prime is 20020021221061. The next prime is 20020021221077. The reversal of 20020021221073 is 37012212002002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18046285640464 + 1973735580609 = 4248092^2 + 1404897^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020021221073 - 2⁹ = 20020021220561 is a prime.

It is not a weakly prime, because it can be changed into another prime (20020021221077) 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, 10010010610536 + 10010010610537.

It is an arithmetic number, because the mean of its divisors is an integer number (10010010610537).

Almost surely, 2^{20020021221073} is an apocalyptic number.

It is an amenable number.

20020021221073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020021221073 is an equidigital number, since it uses as much as digits as its factorization.

20020021221073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 20020021221073 its reverse (37012212002002), we get a palindrome (57032233223075).

The spelling of 20020021221073 in words is "twenty trillion, twenty billion, twenty-one million, two hundred twenty-one thousand, seventy-three".