1020111109992 has 96 divisors (see below), whose sum is σ = 2975627534880. Its totient is φ = 313848328320.

The previous prime is 1020111109991. The next prime is 1020111109993. The reversal of 1020111109992 is 2999011110201.

It is an interprime number because it is at equal distance from previous prime (1020111109991) and next prime (1020111109993).

It is a super-2 number, since 2×1020111109992² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1020111109991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10121367 + ... + 10221657.

It is an arithmetic number, because the mean of its divisors is an integer number (30996120155).

Almost surely, 2^{1020111109992} is an apocalyptic number.

1020111109992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1020111109992 is an abundant number, since it is smaller than the sum of its proper divisors (1955516424888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1020111109992 is a wasteful number, since it uses less digits than its factorization.

1020111109992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111183 (or 111176 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 36.

The spelling of 1020111109992 in words is "one trillion, twenty billion, one hundred eleven million, one hundred nine thousand, nine hundred ninety-two".