12221320403 has 4 divisors (see below), whose sum is σ = 12451911408. Its totient is φ = 11990729400.

The previous prime is 12221320387. The next prime is 12221320421. The reversal of 12221320403 is 30402312221.

12221320403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30402312221 = 61 ⋅498398561.

It is a cyclic number.

It is not a de Polignac number, because 12221320403 - 2⁴ = 12221320387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221320703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115295423 + ... + 115295528.

It is an arithmetic number, because the mean of its divisors is an integer number (3112977852).

Almost surely, 2^12221320403 is an apocalyptic number.

12221320403 is a deficient number, since it is larger than the sum of its proper divisors (230591005).

12221320403 is an equidigital number, since it uses as much as digits as its factorization.

12221320403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230591004.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 12221320403 its reverse (30402312221), we get a palindrome (42623632624).

The spelling of 12221320403 in words is "twelve billion, two hundred twenty-one million, three hundred twenty thousand, four hundred three".