22221212321 has 24 divisors (see below), whose sum is σ = 28731184704. Its totient is φ = 16988506080.

The previous prime is 22221212287. The next prime is 22221212323. The reversal of 22221212321 is 12321212222.

It is not a de Polignac number, because 22221212321 - 2⁶ = 22221212257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22221212293 and 22221212302.

It is not an unprimeable number, because it can be changed into a prime (22221212323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 360365 + ... + 417498.

It is an arithmetic number, because the mean of its divisors is an integer number (1197132696).

Almost surely, 2^22221212321 is an apocalyptic number.

It is an amenable number.

22221212321 is a deficient number, since it is larger than the sum of its proper divisors (6509972383).

22221212321 is a wasteful number, since it uses less digits than its factorization.

22221212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777941 (or 777934 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

Adding to 22221212321 its reverse (12321212222), we get a palindrome (34542424543).

Subtracting from 22221212321 its reverse (12321212222), we obtain a palindrome (9900000099).

The spelling of 22221212321 in words is "twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, three hundred twenty-one".