12403321020 has 120 divisors (see below), whose sum is σ = 39569468400. Its totient is φ = 3251467008.

The previous prime is 12403320997. The next prime is 12403321031. The reversal of 12403321020 is 2012330421.

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 = 12403320984 and 12403321002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 30696 + ... + 160464.

It is an arithmetic number, because the mean of its divisors is an integer number (329745570).

Almost surely, 2^12403321020 is an apocalyptic number.

12403321020 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 12403321020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19784734200).

12403321020 is an abundant number, since it is smaller than the sum of its proper divisors (27166147380).

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

12403321020 is a wasteful number, since it uses less digits than its factorization.

12403321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129849 (or 129838 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 12403321020 its reverse (2012330421), we get a palindrome (14415651441).

The spelling of 12403321020 in words is "twelve billion, four hundred three million, three hundred twenty-one thousand, twenty".