2216507321 has 4 divisors (see below), whose sum is σ = 2533151232. Its totient is φ = 1899863412.

The previous prime is 2216507303. The next prime is 2216507341. The reversal of 2216507321 is 1237056122.

It is a happy number.

2216507321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an emirpimes, since its reverse is a distinct semiprime: 1237056122 = 2 ⋅618528061.

It is a cyclic number.

It is not a de Polignac number, because 2216507321 - 2²² = 2212313017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2216507341) 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, 158321945 + ... + 158321958.

It is an arithmetic number, because the mean of its divisors is an integer number (633287808).

Almost surely, 2^2216507321 is an apocalyptic number.

It is an amenable number.

2216507321 is a deficient number, since it is larger than the sum of its proper divisors (316643911).

2216507321 is an equidigital number, since it uses as much as digits as its factorization.

2216507321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316643910.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 2216507321 is about 47079.7973763694. The cubic root of 2216507321 is about 1303.8362659742.

The spelling of 2216507321 in words is "two billion, two hundred sixteen million, five hundred seven thousand, three hundred twenty-one".