2218022221 has 4 divisors (see below), whose sum is σ = 2227793472. Its totient is φ = 2208250972.

The previous prime is 2218022207. The next prime is 2218022231. The reversal of 2218022221 is 1222208122.

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.

It is a cyclic number.

It is not a de Polignac number, because 2218022221 - 2⁵ = 2218022189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2218022192 and 2218022201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218022201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4885285 + ... + 4885738.

It is an arithmetic number, because the mean of its divisors is an integer number (556948368).

Almost surely, 2^2218022221 is an apocalyptic number.

It is an amenable number.

2218022221 is a deficient number, since it is larger than the sum of its proper divisors (9771251).

2218022221 is an equidigital number, since it uses as much as digits as its factorization.

2218022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9771250.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 2218022221 is about 47095.8832701968. The cubic root of 2218022221 is about 1304.1332394639.

The spelling of 2218022221 in words is "two billion, two hundred eighteen million, twenty-two thousand, two hundred twenty-one".