22120211221 has 16 divisors (see below), whose sum is σ = 22395225600. Its totient is φ = 21847473648.

The previous prime is 22120211213. The next prime is 22120211263. The reversal of 22120211221 is 12211202122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 22120211221 - 2³ = 22120211213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22120211195 and 22120211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22120211821) 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, 25750690 + ... + 25751548.

It is an arithmetic number, because the mean of its divisors is an integer number (1399701600).

Almost surely, 2^22120211221 is an apocalyptic number.

It is an amenable number.

22120211221 is a deficient number, since it is larger than the sum of its proper divisors (275014379).

22120211221 is a wasteful number, since it uses less digits than its factorization.

22120211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22120211221 its reverse (12211202122), we get a palindrome (34331413343).

Subtracting from 22120211221 its reverse (12211202122), we obtain a palindrome (9909009099).

The spelling of 22120211221 in words is "twenty-two billion, one hundred twenty million, two hundred eleven thousand, two hundred twenty-one".