22112211121221 has 32 divisors (see below), whose sum is σ = 32124092797440. Its totient is φ = 13448167786944.

The previous prime is 22112211121219. The next prime is 22112211121249. The reversal of 22112211121221 is 12212111221122.

It is not a de Polignac number, because 22112211121221 - 2¹ = 22112211121219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22112211121261) 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, 4574755 + ... + 8071728.

It is an arithmetic number, because the mean of its divisors is an integer number (1003877899920).

Almost surely, 2^{22112211121221} is an apocalyptic number.

It is an amenable number.

22112211121221 is a deficient number, since it is larger than the sum of its proper divisors (10011881676219).

22112211121221 is a wasteful number, since it uses less digits than its factorization.

22112211121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12647025.

The product of its digits is 128, while the sum is 21.

Adding to 22112211121221 its reverse (12212111221122), we get a palindrome (34324322342343).

Subtracting from 22112211121221 its reverse (12212111221122), we obtain a palindrome (9900099900099).

The spelling of 22112211121221 in words is "twenty-two trillion, one hundred twelve billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".