13212110321 has 4 divisors (see below), whose sum is σ = 13219648932. Its totient is φ = 13204571712.

The previous prime is 13212110309. The next prime is 13212110347. The reversal of 13212110321 is 12301121231.

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 4180269025 + 9031841296 = 64655^2 + 95036^2 .

It is a cyclic number.

It is not a de Polignac number, because 13212110321 - 2¹⁰ = 13212109297 is a prime.

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 13212110321.

It is not an unprimeable number, because it can be changed into a prime (13212710321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3766676 + ... + 3770181.

It is an arithmetic number, because the mean of its divisors is an integer number (3304912233).

Almost surely, 2^13212110321 is an apocalyptic number.

It is an amenable number.

13212110321 is a deficient number, since it is larger than the sum of its proper divisors (7538611).

13212110321 is an equidigital number, since it uses as much as digits as its factorization.

13212110321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7538610.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 13212110321 its reverse (12301121231), we get a palindrome (25513231552).

The spelling of 13212110321 in words is "thirteen billion, two hundred twelve million, one hundred ten thousand, three hundred twenty-one".