12221859 has 8 divisors (see below), whose sum is σ = 17549392. Its totient is φ = 7521120.

The previous prime is 12221851. The next prime is 12221863. The reversal of 12221859 is 95812221.

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

It is not a de Polignac number, because 12221859 - 2³ = 12221851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221851) 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, 156652 + ... + 156729.

It is an arithmetic number, because the mean of its divisors is an integer number (2193674).

Almost surely, 2^12221859 is an apocalyptic number.

12221859 is a deficient number, since it is larger than the sum of its proper divisors (5327533).

12221859 is a wasteful number, since it uses less digits than its factorization.

12221859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313397.

The product of its digits is 2880, while the sum is 30.

The square root of 12221859 is about 3495.9775456945. The cubic root of 12221859 is about 230.3451591421.

It can be divided in two parts, 1222 and 1859, that added together give a triangular number (3081 = T₇₈).

The spelling of 12221859 in words is "twelve million, two hundred twenty-one thousand, eight hundred fifty-nine".