111012123121 has 4 divisors (see below), whose sum is σ = 111012789492. Its totient is φ = 111011456752.

The previous prime is 111012123091. The next prime is 111012123143. The reversal of 111012123121 is 121321210111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121321210111 = 39521 ⋅3069791.

It can be written as a sum of positive squares in 2 ways, for example, as 84062304225 + 26949818896 = 289935^2 + 164164^2 .

It is a cyclic number.

It is not a de Polignac number, because 111012123121 - 2⁷ = 111012122993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111012123095 and 111012123104.

It is not an unprimeable number, because it can be changed into a prime (111012123151) 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, 166071 + ... + 499603.

It is an arithmetic number, because the mean of its divisors is an integer number (27753197373).

Almost surely, 2^111012123121 is an apocalyptic number.

It is an amenable number.

111012123121 is a deficient number, since it is larger than the sum of its proper divisors (666371).

111012123121 is an equidigital number, since it uses as much as digits as its factorization.

111012123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666370.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 111012123121 its reverse (121321210111), we get a palindrome (232333333232).

The spelling of 111012123121 in words is "one hundred eleven billion, twelve million, one hundred twenty-three thousand, one hundred twenty-one".