22222201221 has 48 divisors (see below), whose sum is σ = 36068323200. Its totient is φ = 13065701760.

The previous prime is 22222201207. The next prime is 22222201237. The reversal of 22222201221 is 12210222222.

22222201221 is a `hidden beast` number, since 2 + 222 + 220 + 1 + 221 = 666.

It is not a de Polignac number, because 22222201221 - 2²¹ = 22220104069 is a prime.

It is a super-2 number, since 2×22222201221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22222201194 and 22222201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222201291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1269696 + ... + 1287078.

It is an arithmetic number, because the mean of its divisors is an integer number (751423400).

Almost surely, 2^22222201221 is an apocalyptic number.

It is an amenable number.

22222201221 is a deficient number, since it is larger than the sum of its proper divisors (13846121979).

22222201221 is a wasteful number, since it uses less digits than its factorization.

22222201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17786 (or 17783 counting only the distinct ones).

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

Adding to 22222201221 its reverse (12210222222), we get a palindrome (34432423443).

The spelling of 22222201221 in words is "twenty-two billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty-one".