111211211122120 has 32 divisors (see below), whose sum is σ = 264944355910200. Its totient is φ = 41867750069248.

The previous prime is 111211211122013. The next prime is 111211211122139. The reversal of 111211211122120 is 21221112112111.

It can be written as a sum of positive squares in 4 ways, for example, as 66873697837956 + 44337513284164 = 8177634^2 + 6658642^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81772948675 + ... + 81772950034.

Almost surely, 2^{111211211122120} is an apocalyptic number.

111211211122120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111211211122120 is an abundant number, since it is smaller than the sum of its proper divisors (153733144788080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111211211122120 is a wasteful number, since it uses less digits than its factorization.

111211211122120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163545898737 (or 163545898733 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111211211122120 its reverse (21221112112111), we get a palindrome (132432323234231).

The spelling of 111211211122120 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred eleven million, one hundred twenty-two thousand, one hundred twenty".