13212347 has 2 divisors, whose sum is σ = 13212348. Its totient is φ = 13212346.

The previous prime is 13212341. The next prime is 13212377. The reversal of 13212347 is 74321231.

It is a weak prime.

It is an emirp because it is prime and its reverse (74321231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13212347 - 2¹⁰ = 13211323 is a prime.

It is a super-2 number, since 2×13212347² = 349132226496818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13212341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6606173 + 6606174.

It is an arithmetic number, because the mean of its divisors is an integer number (6606174).

Almost surely, 2^13212347 is an apocalyptic number.

13212347 is a deficient number, since it is larger than the sum of its proper divisors (1).

13212347 is an equidigital number, since it uses as much as digits as its factorization.

13212347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 23.

The square root of 13212347 is about 3634.8792277048. The cubic root of 13212347 is about 236.4068141355.

Adding to 13212347 its sum of digits (23), we get a triangular number (13212370 = T₅₁₄₀).

Adding to 13212347 its reverse (74321231), we get a palindrome (87533578).

The spelling of 13212347 in words is "thirteen million, two hundred twelve thousand, three hundred forty-seven".