1002000099981 has 16 divisors (see below), whose sum is σ = 1338480979520. Its totient is φ = 666760723200.

The previous prime is 1002000099949. The next prime is 1002000100019. The reversal of 1002000099981 is 1899900002001.

It is a happy number.

It is not a de Polignac number, because 1002000099981 - 2⁵ = 1002000099949 is a prime.

It is a super-2 number, since 2×1002000099981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002000099911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3610581 + ... + 3878181.

It is an arithmetic number, because the mean of its divisors is an integer number (83655061220).

Almost surely, 2^{1002000099981} is an apocalyptic number.

It is an amenable number.

1002000099981 is a deficient number, since it is larger than the sum of its proper divisors (336480879539).

1002000099981 is a wasteful number, since it uses less digits than its factorization.

1002000099981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269916.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 1002000099981 in words is "one trillion, two billion, ninety-nine thousand, nine hundred eighty-one".