1231113011020 has 192 divisors, whose sum is σ = 2725350566400. Its totient is φ = 466739159040.

The previous prime is 1231113011017. The next prime is 1231113011071. The reversal of 1231113011020 is 201103111321.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1231113010985 and 1231113011003.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1325201916 + ... + 1325202844.

It is an arithmetic number, because the mean of its divisors is an integer number (14194534200).

Almost surely, 2^{1231113011020} is an apocalyptic number.

1231113011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231113011020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1362675283200).

1231113011020 is an abundant number, since it is smaller than the sum of its proper divisors (1494237555380).

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

1231113011020 is a wasteful number, since it uses less digits than its factorization.

1231113011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1231113011020 its reverse (201103111321), we get a palindrome (1432216122341).

The spelling of 1231113011020 in words is "one trillion, two hundred thirty-one billion, one hundred thirteen million, eleven thousand, twenty".