22112211221121 has 32 divisors (see below), whose sum is σ = 34133270169600. Its totient is φ = 12471412500864.

The previous prime is 22112211221083. The next prime is 22112211221143. The reversal of 22112211221121 is 12112211221122.

It is a de Polignac number, because none of the positive numbers 2^k-22112211221121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (22112211221621) 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, 4218445 + ... + 7875258.

It is an arithmetic number, because the mean of its divisors is an integer number (1066664692800).

Almost surely, 2^{22112211221121} is an apocalyptic number.

22112211221121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22112211221121 is a deficient number, since it is larger than the sum of its proper divisors (12021058948479).

22112211221121 is a wasteful number, since it uses less digits than its factorization.

22112211221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12094845.

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

Adding to 22112211221121 its reverse (12112211221122), we get a palindrome (34224422442243).

Subtracting from 22112211221121 its reverse (12112211221122), we obtain a palindrome (9999999999999).

The spelling of 22112211221121 in words is "twenty-two trillion, one hundred twelve billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".