2216560921 has 8 divisors (see below), whose sum is σ = 2237773824. Its totient is φ = 2195448480.

The previous prime is 2216560909. The next prime is 2216560967. The reversal of 2216560921 is 1290656122.

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-2216560921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2216560981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19600 + ... + 69406.

It is an arithmetic number, because the mean of its divisors is an integer number (279721728).

Almost surely, 2^2216560921 is an apocalyptic number.

It is an amenable number.

2216560921 is a deficient number, since it is larger than the sum of its proper divisors (21212903).

2216560921 is a wasteful number, since it uses less digits than its factorization.

2216560921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50231.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 2216560921 is about 47080.3666192182. The cubic root of 2216560921 is about 1303.8467757613.

The spelling of 2216560921 in words is "two billion, two hundred sixteen million, five hundred sixty thousand, nine hundred twenty-one".