22120222111221 has 16 divisors (see below), whose sum is σ = 32438165324544. Its totient is φ = 13322817898944.

The previous prime is 22120222111187. The next prime is 22120222111231. The reversal of 22120222111221 is 12211122202122.

It is not a de Polignac number, because 22120222111221 - 2⁷ = 22120222111093 is a prime.

It is a super-2 number, since 2×22120222111221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22120222111231) 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, 6033883086 + ... + 6033886751.

It is an arithmetic number, because the mean of its divisors is an integer number (2027385332784).

Almost surely, 2^{22120222111221} is an apocalyptic number.

It is an amenable number.

22120222111221 is a deficient number, since it is larger than the sum of its proper divisors (10317943213323).

22120222111221 is a wasteful number, since it uses less digits than its factorization.

22120222111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12067769900.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 22120222111221 its reverse (12211122202122), we get a palindrome (34331344313343).

Subtracting from 22120222111221 its reverse (12211122202122), we obtain a palindrome (9909099909099).

The spelling of 22120222111221 in words is "twenty-two trillion, one hundred twenty billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".