13211212321 has 16 divisors (see below), whose sum is σ = 13543303680. Its totient is φ = 12882425920.

The previous prime is 13211212283. The next prime is 13211212367. The reversal of 13211212321 is 12321211231.

It is not a de Polignac number, because 13211212321 - 2³³ = 4621277729 is a prime.

It is a super-2 number, since 2×13211212321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13211216321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12451131 + ... + 12452191.

It is an arithmetic number, because the mean of its divisors is an integer number (846456480).

Almost surely, 2^13211212321 is an apocalyptic number.

It is an amenable number.

13211212321 is a deficient number, since it is larger than the sum of its proper divisors (332091359).

13211212321 is a wasteful number, since it uses less digits than its factorization.

13211212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336.

The product of its digits is 144, while the sum is 19.

Adding to 13211212321 its reverse (12321211231), we get a palindrome (25532423552).

The spelling of 13211212321 in words is "thirteen billion, two hundred eleven million, two hundred twelve thousand, three hundred twenty-one".