111121002020 has 48 divisors (see below), whose sum is σ = 267954411648. Its totient is φ = 37918056960.

The previous prime is 111121002001. The next prime is 111121002023. The reversal of 111121002020 is 20200121111.

It is a junction number, because it is equal to n+sod(n) for n = 111121001992 and 111121002010.

It is not an unprimeable number, because it can be changed into a prime (111121002023) 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, 1851317 + ... + 1910396.

It is an arithmetic number, because the mean of its divisors is an integer number (5582383576).

Almost surely, 2^111121002020 is an apocalyptic number.

111121002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111121002020 is an abundant number, since it is smaller than the sum of its proper divisors (156833409628).

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

111121002020 is a wasteful number, since it uses less digits than its factorization.

111121002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3761940 (or 3761938 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111121002020 its reverse (20200121111), we get a palindrome (131321123131).

The spelling of 111121002020 in words is "one hundred eleven billion, one hundred twenty-one million, two thousand, twenty".