2021000119981 has 2 divisors, whose sum is σ = 2021000119982. Its totient is φ = 2021000119980.

The previous prime is 2021000119979. The next prime is 2021000120093. The reversal of 2021000119981 is 1899110001202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1237120083081 + 783880036900 = 1112259^2 + 885370^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021000119981 - 2¹ = 2021000119979 is a prime.

It is a super-2 number, since 2×2021000119981² (a number of 25 digits) contains 22 as substring.

Together with 2021000119979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021000119681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010500059990 + 1010500059991.

It is an arithmetic number, because the mean of its divisors is an integer number (1010500059991).

Almost surely, 2^{2021000119981} is an apocalyptic number.

It is an amenable number.

2021000119981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021000119981 is an equidigital number, since it uses as much as digits as its factorization.

2021000119981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 2021000119981 in words is "two trillion, twenty-one billion, one hundred nineteen thousand, nine hundred eighty-one".