11112122122221 has 32 divisors (see below), whose sum is σ = 15261416755200. Its totient is φ = 7188731184960.

The previous prime is 11112122122181. The next prime is 11112122122247. The reversal of 11112122122221 is 12222122121111.

It is not a de Polignac number, because 11112122122221 - 2¹³ = 11112122114029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112122124221) 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, 64193416 + ... + 64366286.

It is an arithmetic number, because the mean of its divisors is an integer number (476919273600).

Almost surely, 2^{11112122122221} is an apocalyptic number.

It is an amenable number.

11112122122221 is a deficient number, since it is larger than the sum of its proper divisors (4149294632979).

11112122122221 is a wasteful number, since it uses less digits than its factorization.

11112122122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177609.

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

Adding to 11112122122221 its reverse (12222122121111), we get a palindrome (23334244243332).

The spelling of 11112122122221 in words is "eleven trillion, one hundred twelve billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".