1217684221 has 8 divisors (see below), whose sum is σ = 1312181024. Its totient is φ = 1123305840.

The previous prime is 1217684189. The next prime is 1217684227. The reversal of 1217684221 is 1224867121.

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 1217684221 - 2⁵ = 1217684189 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 (1217684227) 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, 7635 + ... + 49936.

It is an arithmetic number, because the mean of its divisors is an integer number (164022628).

Almost surely, 2^1217684221 is an apocalyptic number.

It is an amenable number.

1217684221 is a deficient number, since it is larger than the sum of its proper divisors (94496803).

1217684221 is a wasteful number, since it uses less digits than its factorization.

1217684221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59211.

The product of its digits is 10752, while the sum is 34.

The square root of 1217684221 is about 34895.3323669513. The cubic root of 1217684221 is about 1067.8532148398.

The spelling of 1217684221 in words is "one billion, two hundred seventeen million, six hundred eighty-four thousand, two hundred twenty-one".