2216495221 has 4 divisors (see below), whose sum is σ = 2216593600. Its totient is φ = 2216396844.

The previous prime is 2216495209. The next prime is 2216495227. The reversal of 2216495221 is 1225946122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1225946122 = 2 ⋅612973061.

It is a cyclic number.

It is not a de Polignac number, because 2216495221 - 2¹⁷ = 2216364149 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 (2216495227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3220 + ... + 66658.

It is an arithmetic number, because the mean of its divisors is an integer number (554148400).

Almost surely, 2^2216495221 is an apocalyptic number.

It is an amenable number.

2216495221 is a deficient number, since it is larger than the sum of its proper divisors (98379).

2216495221 is an equidigital number, since it uses as much as digits as its factorization.

2216495221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98378.

The product of its digits is 17280, while the sum is 34.

The square root of 2216495221 is about 47079.6688709681. The cubic root of 2216495221 is about 1303.8338934055.

The spelling of 2216495221 in words is "two billion, two hundred sixteen million, four hundred ninety-five thousand, two hundred twenty-one".