20020021999973 has 2 divisors, whose sum is σ = 20020021999974. Its totient is φ = 20020021999972.

The previous prime is 20020021999891. The next prime is 20020022000009. The reversal of 20020021999973 is 37999912002002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15658031022529 + 4361990977444 = 3957023^2 + 2088538^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020021999973 - 2⁸ = 20020021999717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020021993973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010010999986 + 10010010999987.

It is an arithmetic number, because the mean of its divisors is an integer number (10010010999987).

Almost surely, 2^{20020021999973} is an apocalyptic number.

It is an amenable number.

20020021999973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020021999973 is an equidigital number, since it uses as much as digits as its factorization.

20020021999973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The spelling of 20020021999973 in words is "twenty trillion, twenty billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred seventy-three".