13212231 has 8 divisors (see below), whose sum is σ = 18184704. Its totient is φ = 8523960.

The previous prime is 13212229. The next prime is 13212259. The reversal of 13212231 is 13221231.

13212231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13212231 - 2¹ = 13212229 is a prime.

It is a super-2 number, since 2×13212231² = 349126095994722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13212231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13212131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70941 + ... + 71126.

It is an arithmetic number, because the mean of its divisors is an integer number (2273088).

Almost surely, 2^13212231 is an apocalyptic number.

13212231 is a deficient number, since it is larger than the sum of its proper divisors (4972473).

13212231 is a wasteful number, since it uses less digits than its factorization.

13212231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142101.

The product of its digits is 72, while the sum is 15.

The square root of 13212231 is about 3634.8632711562. The cubic root of 13212231 is about 236.4061222758.

Adding to 13212231 its reverse (13221231), we get a palindrome (26433462).

The spelling of 13212231 in words is "thirteen million, two hundred twelve thousand, two hundred thirty-one".