1012002199981 has 2 divisors, whose sum is σ = 1012002199982. Its totient is φ = 1012002199980.

The previous prime is 1012002199937. The next prime is 1012002200017. The reversal of 1012002199981 is 1899912002101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 793006279081 + 218995920900 = 890509^2 + 467970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012002199981 - 2⁹ = 1012002199469 is a prime.

It is a super-2 number, since 2×1012002199981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012002196981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506001099990 + 506001099991.

It is an arithmetic number, because the mean of its divisors is an integer number (506001099991).

Almost surely, 2^{1012002199981} is an apocalyptic number.

It is an amenable number.

1012002199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012002199981 is an equidigital number, since it uses as much as digits as its factorization.

1012002199981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 43.

The spelling of 1012002199981 in words is "one trillion, twelve billion, two million, one hundred ninety-nine thousand, nine hundred eighty-one".