111010122121 has 4 divisors (see below), whose sum is σ = 113591752912. Its totient is φ = 108428491332.

The previous prime is 111010122109. The next prime is 111010122143. The reversal of 111010122121 is 121221010111.

It is a happy number.

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: 121221010111 = 421 ⋅287935891.

It is a cyclic number.

It is not a de Polignac number, because 111010122121 - 2¹⁵ = 111010089353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111010122161) 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, 1290815331 + ... + 1290815416.

It is an arithmetic number, because the mean of its divisors is an integer number (28397938228).

Almost surely, 2^111010122121 is an apocalyptic number.

It is an amenable number.

111010122121 is a deficient number, since it is larger than the sum of its proper divisors (2581630791).

111010122121 is an equidigital number, since it uses as much as digits as its factorization.

111010122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581630790.

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

Adding to 111010122121 its reverse (121221010111), we get a palindrome (232231132232).

The spelling of 111010122121 in words is "one hundred eleven billion, ten million, one hundred twenty-two thousand, one hundred twenty-one".