13212287 has 4 divisors (see below), whose sum is σ = 14413416. Its totient is φ = 12011160.

The previous prime is 13212263. The next prime is 13212289. The reversal of 13212287 is 78221231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78221231 = 11 ⋅7111021.

It is a cyclic number.

It is not a de Polignac number, because 13212287 - 2¹⁸ = 12950143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13212289) 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, 600548 + ... + 600569.

It is an arithmetic number, because the mean of its divisors is an integer number (3603354).

Almost surely, 2^13212287 is an apocalyptic number.

13212287 is a deficient number, since it is larger than the sum of its proper divisors (1201129).

13212287 is a wasteful number, since it uses less digits than its factorization.

13212287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201128.

The product of its digits is 1344, while the sum is 26.

The square root of 13212287 is about 3634.8709743263. The cubic root of 13212287 is about 236.4064562775.

The spelling of 13212287 in words is "thirteen million, two hundred twelve thousand, two hundred eighty-seven".