121112123213 has 8 divisors (see below), whose sum is σ = 123857672568. Its totient is φ = 118395938304.

The previous prime is 121112123203. The next prime is 121112123257. The reversal of 121112123213 is 312321211121.

It can be written as a sum of positive squares in 4 ways, for example, as 25221568969 + 95890554244 = 158813^2 + 309662^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121112123213 - 2¹⁸ = 121111861069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112123203) 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 7 ways as a sum of consecutive naturals, for example, 7332770 + ... + 7349267.

It is an arithmetic number, because the mean of its divisors is an integer number (15482209071).

Almost surely, 2^121112123213 is an apocalyptic number.

It is an amenable number.

121112123213 is a deficient number, since it is larger than the sum of its proper divisors (2745549355).

121112123213 is a wasteful number, since it uses less digits than its factorization.

121112123213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14682223.

The product of its digits is 144, while the sum is 20.

Adding to 121112123213 its reverse (312321211121), we get a palindrome (433433334334).

The spelling of 121112123213 in words is "one hundred twenty-one billion, one hundred twelve million, one hundred twenty-three thousand, two hundred thirteen".