13340212121 has 4 divisors (see below), whose sum is σ = 13347336372. Its totient is φ = 13333087872.

The previous prime is 13340212099. The next prime is 13340212139. The reversal of 13340212121 is 12121204331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4669808896 + 8670403225 = 68336^2 + 93115^2 .

It is a cyclic number.

It is not a de Polignac number, because 13340212121 - 2¹⁰ = 13340211097 is a prime.

It is a super-2 number, since 2×13340212121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13340212093 and 13340212102.

It is not an unprimeable number, because it can be changed into a prime (13340212181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3559316 + ... + 3563061.

It is an arithmetic number, because the mean of its divisors is an integer number (3336834093).

Almost surely, 2^13340212121 is an apocalyptic number.

It is an amenable number.

13340212121 is a deficient number, since it is larger than the sum of its proper divisors (7124251).

13340212121 is an equidigital number, since it uses as much as digits as its factorization.

13340212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124250.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 13340212121 its reverse (12121204331), we get a palindrome (25461416452).

The spelling of 13340212121 in words is "thirteen billion, three hundred forty million, two hundred twelve thousand, one hundred twenty-one".