12402221 has 8 divisors (see below), whose sum is σ = 13937280. Its totient is φ = 10950192.

The previous prime is 12402217. The next prime is 12402223. The reversal of 12402221 is 12220421.

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 12402221 - 2² = 12402217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12402196 and 12402205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12402223) 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, 20441 + ... + 21038.

It is an arithmetic number, because the mean of its divisors is an integer number (1742160).

Almost surely, 2^12402221 is an apocalyptic number.

It is an amenable number.

12402221 is a deficient number, since it is larger than the sum of its proper divisors (1535059).

12402221 is a wasteful number, since it uses less digits than its factorization.

12402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41515.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 12402221 is about 3521.6787190202. The cubic root of 12402221 is about 231.4727237198.

Adding to 12402221 its reverse (12220421), we get a palindrome (24622642).

The spelling of 12402221 in words is "twelve million, four hundred two thousand, two hundred twenty-one".