1020012099981 has 12 divisors (see below), whose sum is σ = 1582059583872. Its totient is φ = 582864057048.

The previous prime is 1020012099959. The next prime is 1020012100001. The reversal of 1020012099981 is 1899902100201.

It is not a de Polignac number, because 1020012099981 - 2⁵ = 1020012099949 is a prime.

It is a super-2 number, since 2×1020012099981² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020012099881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3469428765 + ... + 3469429058.

It is an arithmetic number, because the mean of its divisors is an integer number (131838298656).

Almost surely, 2^{1020012099981} is an apocalyptic number.

It is an amenable number.

1020012099981 is a deficient number, since it is larger than the sum of its proper divisors (562047483891).

1020012099981 is an equidigital number, since it uses as much as digits as its factorization.

1020012099981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6938857840 (or 6938857833 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 42.

The spelling of 1020012099981 in words is "one trillion, twenty billion, twelve million, ninety-nine thousand, nine hundred eighty-one".