1011111121980 has 72 divisors (see below), whose sum is σ = 3067299812304. Its totient is φ = 269606534400.

The previous prime is 1011111121939. The next prime is 1011111121981. The reversal of 1011111121980 is 891211111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011111121981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1920160 + ... + 2389400.

It is an arithmetic number, because the mean of its divisors is an integer number (42601386282).

Almost surely, 2^{1011111121980} is an apocalyptic number.

1011111121980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011111121980 is an abundant number, since it is smaller than the sum of its proper divisors (2056188690324).

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

1011111121980 is a wasteful number, since it uses less digits than its factorization.

1011111121980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481227 (or 481222 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 27.

The spelling of 1011111121980 in words is "one trillion, eleven billion, one hundred eleven million, one hundred twenty-one thousand, nine hundred eighty".