20111222211121 has 16 divisors (see below), whose sum is σ = 20350842770880. Its totient is φ = 19871909221120.

The previous prime is 20111222211109. The next prime is 20111222211167. The reversal of 20111222211121 is 12111222211102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20111222211121 - 2¹⁵ = 20111222178353 is a prime.

It is a super-2 number, since 2×20111222211121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111222271121) 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, 1395539406 + ... + 1395553816.

It is an arithmetic number, because the mean of its divisors is an integer number (1271927673180).

Almost surely, 2^{20111222211121} is an apocalyptic number.

It is an amenable number.

20111222211121 is a deficient number, since it is larger than the sum of its proper divisors (239620559759).

20111222211121 is a wasteful number, since it uses less digits than its factorization.

20111222211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23936.

The product of its (nonzero) digits is 64, while the sum is 19.

Subtracting from 20111222211121 its sum of digits (19), we obtain a palindrome (20111222211102).

Adding to 20111222211121 its reverse (12111222211102), we get a palindrome (32222444422223).

The spelling of 20111222211121 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-two million, two hundred eleven thousand, one hundred twenty-one".