123231011020 has 72 divisors (see below), whose sum is σ = 282998212560. Its totient is φ = 45050054400.

The previous prime is 123231011011. The next prime is 123231011027. The reversal of 123231011020 is 20110132321.

It is a super-2 number, since 2×123231011020² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123231010985 and 123231011003.

It is not an unprimeable number, because it can be changed into a prime (123231011027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160891 + ... + 521869.

It is an arithmetic number, because the mean of its divisors is an integer number (3930530730).

Almost surely, 2^123231011020 is an apocalyptic number.

123231011020 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 123231011020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141499106280).

123231011020 is an abundant number, since it is smaller than the sum of its proper divisors (159767201540).

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

123231011020 is a wasteful number, since it uses less digits than its factorization.

123231011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361115 (or 361100 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 123231011020 its reverse (20110132321), we get a palindrome (143341143341).

The spelling of 123231011020 in words is "one hundred twenty-three billion, two hundred thirty-one million, eleven thousand, twenty".