123013321020 has 144 divisors (see below), whose sum is σ = 379902851328. Its totient is φ = 32210887680.

The previous prime is 123013320977. The next prime is 123013321073. The reversal of 123013321020 is 20123310321.

123013321020 is a `hidden beast` number, since 1 + 2 + 301 + 332 + 10 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 123013320984 and 123013321002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6655632 + ... + 6674088.

Almost surely, 2^123013321020 is an apocalyptic number.

123013321020 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 123013321020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189951425664).

123013321020 is an abundant number, since it is smaller than the sum of its proper divisors (256889530308).

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

123013321020 is a wasteful number, since it uses less digits than its factorization.

123013321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19140 (or 19135 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 123013321020 its reverse (20123310321), we get a palindrome (143136631341).

The spelling of 123013321020 in words is "one hundred twenty-three billion, thirteen million, three hundred twenty-one thousand, twenty".