111100021222121 has 16 divisors (see below), whose sum is σ = 111997976484240. Its totient is φ = 110205840660480.

The previous prime is 111100021222111. The next prime is 111100021222123. The reversal of 111100021222121 is 121222120001111.

It can be written as a sum of positive squares in 8 ways, for example, as 2116547786896 + 108983473435225 = 1454836^2 + 10439515^2 .

It is a cyclic number.

It is not a de Polignac number, because 111100021222121 - 2¹⁰ = 111100021221097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111100021222121.

It is not an unprimeable number, because it can be changed into a prime (111100021222123) 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, 331303091 + ... + 331638263.

It is an arithmetic number, because the mean of its divisors is an integer number (6999873530265).

Almost surely, 2^{111100021222121} is an apocalyptic number.

It is an amenable number.

111100021222121 is a deficient number, since it is larger than the sum of its proper divisors (897955262119).

111100021222121 is a wasteful number, since it uses less digits than its factorization.

111100021222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340796.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111100021222121 its reverse (121222120001111), we get a palindrome (232322141223232).

The spelling of 111100021222121 in words is "one hundred eleven trillion, one hundred billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".