111212110121121 has 10 divisors (see below), whose sum is σ = 166131670674882. Its totient is φ = 74141406747360.

The previous prime is 111212110121113. The next prime is 111212110121143. The reversal of 111212110121121 is 121121011212111.

111212110121121 is a `hidden beast` number, since 111 + 212 + 110 + 1 + 211 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 83709050040225 + 27503060080896 = 9149265^2 + 5244336^2 .

It is not a de Polignac number, because 111212110121121 - 2³ = 111212110121113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111212110121094 and 111212110121103.

It is not an unprimeable number, because it can be changed into a prime (111212110121171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 686494506840 + ... + 686494507001.

Almost surely, 2^{111212110121121} is an apocalyptic number.

It is an amenable number.

111212110121121 is a deficient number, since it is larger than the sum of its proper divisors (54919560553761).

111212110121121 is an equidigital number, since it uses as much as digits as its factorization.

111212110121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372989013853 (or 1372989013844 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111212110121121 its reverse (121121011212111), we get a palindrome (232333121333232).

The spelling of 111212110121121 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred ten million, one hundred twenty-one thousand, one hundred twenty-one".