22219791221 has 4 divisors (see below), whose sum is σ = 22220170944. Its totient is φ = 22219411500.

The previous prime is 22219791211. The next prime is 22219791239. The reversal of 22219791221 is 12219791222.

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: 12219791222 = 2 ⋅6109895611.

It is a cyclic number.

It is not a de Polignac number, because 22219791221 - 2⁶ = 22219791157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22219791211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81455 + ... + 225996.

It is an arithmetic number, because the mean of its divisors is an integer number (5555042736).

Almost surely, 2^22219791221 is an apocalyptic number.

It is an amenable number.

22219791221 is a deficient number, since it is larger than the sum of its proper divisors (379723).

22219791221 is an equidigital number, since it uses as much as digits as its factorization.

22219791221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379722.

The product of its digits is 18144, while the sum is 38.

Subtracting from 22219791221 its reverse (12219791222), we obtain a palindrome (9999999999).

The spelling of 22219791221 in words is "twenty-two billion, two hundred nineteen million, seven hundred ninety-one thousand, two hundred twenty-one".