12207561221 has 8 divisors (see below), whose sum is σ = 12313238784. Its totient is φ = 12102338880.

The previous prime is 12207561187. The next prime is 12207561227. The reversal of 12207561221 is 12216570221.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12207561221 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 (12207561227) 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, 59831 + ... + 167316.

It is an arithmetic number, because the mean of its divisors is an integer number (1539154848).

Almost surely, 2^12207561221 is an apocalyptic number.

It is an amenable number.

12207561221 is a deficient number, since it is larger than the sum of its proper divisors (105677563).

12207561221 is a wasteful number, since it uses less digits than its factorization.

12207561221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227611.

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 12207561221 in words is "twelve billion, two hundred seven million, five hundred sixty-one thousand, two hundred twenty-one".