2216211221 has 8 divisors (see below), whose sum is σ = 2534525760. Its totient is φ = 1898324928.

The previous prime is 2216211199. The next prime is 2216211223. The reversal of 2216211221 is 1221126122.

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-2216211221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2216211193 and 2216211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216211223) 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, 95891 + ... + 116736.

It is an arithmetic number, because the mean of its divisors is an integer number (316815720).

Almost surely, 2^2216211221 is an apocalyptic number.

It is an amenable number.

2216211221 is a deficient number, since it is larger than the sum of its proper divisors (318314539).

2216211221 is a wasteful number, since it uses less digits than its factorization.

2216211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214123.

The product of its digits is 192, while the sum is 20.

The square root of 2216211221 is about 47076.6526103970. The cubic root of 2216211221 is about 1303.7782041897.

Adding to 2216211221 its reverse (1221126122), we get a palindrome (3437337343).

The spelling of 2216211221 in words is "two billion, two hundred sixteen million, two hundred eleven thousand, two hundred twenty-one".