111201022121 has 4 divisors (see below), whose sum is σ = 127086882432. Its totient is φ = 95315161812.

The previous prime is 111201022111. The next prime is 111201022139. The reversal of 111201022121 is 121220102111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121220102111 = 127 ⋅954488993.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111201022121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111201022096 and 111201022105.

It is not an unprimeable number, because it can be changed into a prime (111201022111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7942930145 + ... + 7942930158.

It is an arithmetic number, because the mean of its divisors is an integer number (31771720608).

Almost surely, 2^111201022121 is an apocalyptic number.

It is an amenable number.

111201022121 is a deficient number, since it is larger than the sum of its proper divisors (15885860311).

111201022121 is an equidigital number, since it uses as much as digits as its factorization.

111201022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15885860310.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111201022121 its reverse (121220102111), we get a palindrome (232421124232).

The spelling of 111201022121 in words is "one hundred eleven billion, two hundred one million, twenty-two thousand, one hundred twenty-one".