12403320021 has 8 divisors (see below), whose sum is σ = 18375288960. Its totient is φ = 8268879996.

The previous prime is 12403320019. The next prime is 12403320031. The reversal of 12403320021 is 12002330421.

It is not a de Polignac number, because 12403320021 - 2¹ = 12403320019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12403319976 and 12403320003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12403320001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229691085 + ... + 229691138.

It is an arithmetic number, because the mean of its divisors is an integer number (2296911120).

Almost surely, 2^12403320021 is an apocalyptic number.

It is an amenable number.

12403320021 is a deficient number, since it is larger than the sum of its proper divisors (5971968939).

12403320021 is an equidigital number, since it uses as much as digits as its factorization.

12403320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459382232 (or 459382226 counting only the distinct ones).

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

Adding to 12403320021 its reverse (12002330421), we get a palindrome (24405650442).

The spelling of 12403320021 in words is "twelve billion, four hundred three million, three hundred twenty thousand, twenty-one".