20020021000981 has 2 divisors, whose sum is σ = 20020021000982. Its totient is φ = 20020021000980.

The previous prime is 20020021000957. The next prime is 20020021001039. The reversal of 20020021000981 is 18900012002002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18193347113956 + 1826673887025 = 4265366^2 + 1351545^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020021000981 - 2⁷ = 20020021000853 is a prime.

It is a super-3 number, since 3×20020021000981³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020021009981) 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, 10010010500490 + 10010010500491.

It is an arithmetic number, because the mean of its divisors is an integer number (10010010500491).

Almost surely, 2^{20020021000981} is an apocalyptic number.

It is an amenable number.

20020021000981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020021000981 is an equidigital number, since it uses as much as digits as its factorization.

20020021000981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 20020021000981 its reverse (18900012002002), we get a palindrome (38920033002983).

The spelling of 20020021000981 in words is "twenty trillion, twenty billion, twenty-one million, nine hundred eighty-one", and thus it is an aban number.