12221278 has 8 divisors (see below), whose sum is σ = 18455400. Its totient is φ = 6069480.

The previous prime is 12221273. The next prime is 12221327. The reversal of 12221278 is 87212221.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221273) 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, 20208 + ... + 20803.

It is an arithmetic number, because the mean of its divisors is an integer number (2306925).

Almost surely, 2^12221278 is an apocalyptic number.

12221278 is a deficient number, since it is larger than the sum of its proper divisors (6234122).

12221278 is a wasteful number, since it uses less digits than its factorization.

12221278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41162.

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

The square root of 12221278 is about 3495.8944492075. The cubic root of 12221278 is about 230.3415090520.

Adding to 12221278 its reverse (87212221), we get a palindrome (99433499).

It can be divided in two parts, 1222 and 1278, that added together give a square (2500 = 50²).

The spelling of 12221278 in words is "twelve million, two hundred twenty-one thousand, two hundred seventy-eight".