13212312321 has 16 divisors (see below), whose sum is σ = 19970027840. Its totient is φ = 7702724160.

The previous prime is 13212312247. The next prime is 13212312383. The reversal of 13212312321 is 12321321231.

It is not a de Polignac number, because 13212312321 - 2¹⁰ = 13212311297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13212312821) 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, 8914450 + ... + 8915931.

It is an arithmetic number, because the mean of its divisors is an integer number (1248126740).

Almost surely, 2^13212312321 is an apocalyptic number.

It is an amenable number.

13212312321 is a deficient number, since it is larger than the sum of its proper divisors (6757715519).

13212312321 is a wasteful number, since it uses less digits than its factorization.

13212312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17830416.

The product of its digits is 432, while the sum is 21.

Adding to 13212312321 its reverse (12321321231), we get a palindrome (25533633552).

The spelling of 13212312321 in words is "thirteen billion, two hundred twelve million, three hundred twelve thousand, three hundred twenty-one".