22220212221 has 32 divisors (see below), whose sum is σ = 33180806400. Its totient is φ = 14695940160.

The previous prime is 22220212199. The next prime is 22220212229. The reversal of 22220212221 is 12221202222.

It is not a de Polignac number, because 22220212221 - 2¹³ = 22220204029 is a prime.

It is a super-2 number, since 2×22220212221² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22220212194 and 22220212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220212229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2434815 + ... + 2443923.

It is an arithmetic number, because the mean of its divisors is an integer number (1036900200).

Almost surely, 2^22220212221 is an apocalyptic number.

It is an amenable number.

22220212221 is a deficient number, since it is larger than the sum of its proper divisors (10960594179).

22220212221 is a wasteful number, since it uses less digits than its factorization.

22220212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9826 (or 9820 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22220212221 its reverse (12221202222), we get a palindrome (34441414443).

Subtracting from 22220212221 its reverse (12221202222), we obtain a palindrome (9999009999).

The spelling of 22220212221 in words is "twenty-two billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-one".