111211200121 has 24 divisors (see below), whose sum is σ = 136222020000. Its totient is φ = 90276971904.

The previous prime is 111211200103. The next prime is 111211200127. The reversal of 111211200121 is 121002112111.

It is a happy number.

It is not a de Polignac number, because 111211200121 - 2¹⁹ = 111210675833 is a prime.

It is a super-2 number, since 2×111211200121² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111211200127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3053265 + ... + 3089473.

It is an arithmetic number, because the mean of its divisors is an integer number (5675917500).

Almost surely, 2^111211200121 is an apocalyptic number.

It is an amenable number.

111211200121 is a deficient number, since it is larger than the sum of its proper divisors (25010819879).

111211200121 is a wasteful number, since it uses less digits than its factorization.

111211200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39541 (or 39534 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111211200121 its reverse (121002112111), we get a palindrome (232213312232).

The spelling of 111211200121 in words is "one hundred eleven billion, two hundred eleven million, two hundred thousand, one hundred twenty-one".