13211212121 has 8 divisors (see below), whose sum is σ = 13876911744. Its totient is φ = 12553120800.

The previous prime is 13211212043. The next prime is 13211212153. The reversal of 13211212121 is 12121211231.

It is a happy number.

13211212121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13211212121 - 2¹⁸ = 13210949977 is a prime.

It is a super-2 number, since 2×13211212121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13211212121.

It is not an unprimeable number, because it can be changed into a prime (13211212171) 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 7 ways as a sum of consecutive naturals, for example, 1898516 + ... + 1905461.

It is an arithmetic number, because the mean of its divisors is an integer number (1734613968).

Almost surely, 2^13211212121 is an apocalyptic number.

It is an amenable number.

13211212121 is a deficient number, since it is larger than the sum of its proper divisors (665699623).

13211212121 is a wasteful number, since it uses less digits than its factorization.

13211212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804151.

The product of its digits is 48, while the sum is 17.

Adding to 13211212121 its reverse (12121211231), we get a palindrome (25332423352).

The spelling of 13211212121 in words is "thirteen billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-one".