111222122222121 has 32 divisors (see below), whose sum is σ = 149116230804480. Its totient is φ = 73739229781824.

The previous prime is 111222122222069. The next prime is 111222122222221. The reversal of 111222122222121 is 121222221222111.

It is not a de Polignac number, because 111222122222121 - 2¹³ = 111222122213929 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111222122222091 and 111222122222100.

It is not an unprimeable number, because it can be changed into a prime (111222122222221) 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, 913175295 + ... + 913297083.

It is an arithmetic number, because the mean of its divisors is an integer number (4659882212640).

Almost surely, 2^{111222122222121} is an apocalyptic number.

It is an amenable number.

111222122222121 is a deficient number, since it is larger than the sum of its proper divisors (37894108582359).

111222122222121 is a wasteful number, since it uses less digits than its factorization.

111222122222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124205.

The product of its digits is 512, while the sum is 24.

Adding to 111222122222121 its reverse (121222221222111), we get a palindrome (232444343444232).

The spelling of 111222122222121 in words is "one hundred eleven trillion, two hundred twenty-two billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".