13121213211 has 18 divisors (see below), whose sum is σ = 20002888620. Its totient is φ = 8287079976.

The previous prime is 13121213191. The next prime is 13121213219. The reversal of 13121213211 is 11231212131.

13121213211 is a `hidden beast` number, since 131 + 212 + 1 + 321 + 1 = 666.

13121213211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-13121213211 is a prime.

It is a super-2 number, since 2×13121213211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13121213219) 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 17 ways as a sum of consecutive naturals, for example, 2016021 + ... + 2022518.

It is an arithmetic number, because the mean of its divisors is an integer number (1111271590).

Almost surely, 2^13121213211 is an apocalyptic number.

13121213211 is a deficient number, since it is larger than the sum of its proper divisors (6881675409).

13121213211 is a wasteful number, since it uses less digits than its factorization.

13121213211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038583 (or 4038561 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 13121213211 its reverse (11231212131), we get a palindrome (24352425342).

The spelling of 13121213211 in words is "thirteen billion, one hundred twenty-one million, two hundred thirteen thousand, two hundred eleven".