18222022221 has 16 divisors (see below), whose sum is σ = 26174929536. Its totient is φ = 11209277376.

The previous prime is 18222022207. The next prime is 18222022229. The reversal of 18222022221 is 12222022281.

It is a happy number.

It is not a de Polignac number, because 18222022221 - 2¹³ = 18222014029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18222022191 and 18222022200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18222022229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16131 + ... + 191583.

It is an arithmetic number, because the mean of its divisors is an integer number (1635933096).

Almost surely, 2^18222022221 is an apocalyptic number.

It is an amenable number.

18222022221 is a deficient number, since it is larger than the sum of its proper divisors (7952907315).

18222022221 is a wasteful number, since it uses less digits than its factorization.

18222022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178132.

The product of its (nonzero) digits is 1024, while the sum is 24.

The spelling of 18222022221 in words is "eighteen billion, two hundred twenty-two million, twenty-two thousand, two hundred twenty-one".