123111132020 has 24 divisors (see below), whose sum is σ = 259487386368. Its totient is φ = 49062736800.

The previous prime is 123111132007. The next prime is 123111132029. The reversal of 123111132020 is 20231111321.

It is a self number, because there is not a number n which added to its sum of digits gives 123111132020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123111132029) 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 7 ways as a sum of consecutive naturals, for example, 11351696 + ... + 11362535.

It is an arithmetic number, because the mean of its divisors is an integer number (10811974432).

Almost surely, 2^123111132020 is an apocalyptic number.

123111132020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123111132020 is an abundant number, since it is smaller than the sum of its proper divisors (136376254348).

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

123111132020 is a wasteful number, since it uses less digits than its factorization.

123111132020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22714511 (or 22714509 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 123111132020 its reverse (20231111321), we get a palindrome (143342243341).

The spelling of 123111132020 in words is "one hundred twenty-three billion, one hundred eleven million, one hundred thirty-two thousand, twenty".