1111123121020 has 96 divisors (see below), whose sum is σ = 2659330699200. Its totient is φ = 386249472000.

The previous prime is 1111123120981. The next prime is 1111123121039. The reversal of 1111123121020 is 201213211111.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1111123120985 and 1111123121003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217785 + ... + 1506544.

It is an arithmetic number, because the mean of its divisors is an integer number (27701361450).

Almost surely, 2^{1111123121020} is an apocalyptic number.

1111123121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111123121020 is an abundant number, since it is smaller than the sum of its proper divisors (1548207578180).

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

1111123121020 is a wasteful number, since it uses less digits than its factorization.

1111123121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724479 (or 1724477 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1111123121020 its reverse (201213211111), we get a palindrome (1312336332131).

Subtracting from 1111123121020 its reverse (201213211111), we obtain a palindrome (909909909909).

The spelling of 1111123121020 in words is "one trillion, one hundred eleven billion, one hundred twenty-three million, one hundred twenty-one thousand, twenty".