13221212231 has 16 divisors (see below), whose sum is σ = 13619829888. Its totient is φ = 12826425600.

The previous prime is 13221212219. The next prime is 13221212261.

13221212231 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 13221212231 - 2¹⁰ = 13221211207 is a prime.

It is a super-3 number, since 3×13221212231³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221212261) 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, 8854721 + ... + 8856213.

It is an arithmetic number, because the mean of its divisors is an integer number (851239368).

Almost surely, 2^13221212231 is an apocalyptic number.

13221212231 is a deficient number, since it is larger than the sum of its proper divisors (398617657).

13221212231 is a wasteful number, since it uses less digits than its factorization.

13221212231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602.

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

The spelling of 13221212231 in words is "thirteen billion, two hundred twenty-one million, two hundred twelve thousand, two hundred thirty-one".