111111010210121 has 4 divisors (see below), whose sum is σ = 111115556697600. Its totient is φ = 111106463722644.

The previous prime is 111111010210097. The next prime is 111111010210127. The reversal of 111111010210121 is 121012010111111.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111111010210121 is a prime.

It is a super-2 number, since 2×111111010210121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111010210096 and 111111010210105.

It is not an unprimeable number, because it can be changed into a prime (111111010210127) 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 3 ways as a sum of consecutive naturals, for example, 2273207081 + ... + 2273255958.

It is an arithmetic number, because the mean of its divisors is an integer number (27778889174400).

Almost surely, 2^{111111010210121} is an apocalyptic number.

It is an amenable number.

111111010210121 is a deficient number, since it is larger than the sum of its proper divisors (4546487479).

111111010210121 is an equidigital number, since it uses as much as digits as its factorization.

111111010210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546487478.

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

Adding to 111111010210121 its reverse (121012010111111), we get a palindrome (232123020321232).

The spelling of 111111010210121 in words is "one hundred eleven trillion, one hundred eleven billion, ten million, two hundred ten thousand, one hundred twenty-one".