12221287 has 8 divisors (see below), whose sum is σ = 13213760. Its totient is φ = 11236320.

The previous prime is 12221273. The next prime is 12221327. The reversal of 12221287 is 78212221.

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

It is a cyclic number.

It is not a de Polignac number, because 12221287 - 2¹⁹ = 11696999 is a prime.

It is a Duffinian number.

12221287 is a modest number, since divided by 1287 gives 1222 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221207) 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, 1789 + ... + 5257.

It is an arithmetic number, because the mean of its divisors is an integer number (1651720).

Almost surely, 2^12221287 is an apocalyptic number.

12221287 is a deficient number, since it is larger than the sum of its proper divisors (992473).

12221287 is a wasteful number, since it uses less digits than its factorization.

12221287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753.

The product of its digits is 896, while the sum is 25.

The square root of 12221287 is about 3495.8957364315. The cubic root of 12221287 is about 230.3415655947.

The spelling of 12221287 in words is "twelve million, two hundred twenty-one thousand, two hundred eighty-seven".