111210111010121 has 4 divisors (see below), whose sum is σ = 112311201218244. Its totient is φ = 110109020802000.

The previous prime is 111210111010081. The next prime is 111210111010123. The reversal of 111210111010121 is 121010111012111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63362953207225 + 47847157802896 = 7960085^2 + 6917164^2 .

It is a cyclic number.

It is not a de Polignac number, because 111210111010121 - 2¹⁸ = 111210110747977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111210111010096 and 111210111010105.

It is not an unprimeable number, because it can be changed into a prime (111210111010123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550545103910 + ... + 550545104111.

It is an arithmetic number, because the mean of its divisors is an integer number (28077800304561).

Almost surely, 2^{111210111010121} is an apocalyptic number.

It is an amenable number.

111210111010121 is a deficient number, since it is larger than the sum of its proper divisors (1101090208123).

111210111010121 is a wasteful number, since it uses less digits than its factorization.

111210111010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101090208122.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 111210111010121 its reverse (121010111012111), we get a palindrome (232220222022232).

The spelling of 111210111010121 in words is "one hundred eleven trillion, two hundred ten billion, one hundred eleven million, ten thousand, one hundred twenty-one".