13203212121 has 12 divisors (see below), whose sum is σ = 20805061680. Its totient is φ = 8001946680.

The previous prime is 13203212111. The next prime is 13203212131. The reversal of 13203212121 is 12121230231.

13203212121 is a `hidden beast` number, since 1 + 320 + 321 + 2 + 1 + 21 = 666.

13203212121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13203212111) and next prime (13203212131).

It is not a de Polignac number, because 13203212121 - 2¹⁰ = 13203211097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13203212094 and 13203212103.

It is not an unprimeable number, because it can be changed into a prime (13203212101) 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 11 ways as a sum of consecutive naturals, for example, 66682791 + ... + 66682988.

It is an arithmetic number, because the mean of its divisors is an integer number (1733755140).

Almost surely, 2^13203212121 is an apocalyptic number.

13203212121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13203212121 is a deficient number, since it is larger than the sum of its proper divisors (7601849559).

13203212121 is a wasteful number, since it uses less digits than its factorization.

13203212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133365796 (or 133365793 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 13203212121 its reverse (12121230231), we get a palindrome (25324442352).

The spelling of 13203212121 in words is "thirteen billion, two hundred three million, two hundred twelve thousand, one hundred twenty-one".