121112321121 has 20 divisors (see below), whose sum is σ = 197368228464. Its totient is φ = 73401406200.

The previous prime is 121112321119. The next prime is 121112321123. The reversal of 121112321121 is 121123211121.

It is a happy number.

121112321121 is a `hidden beast` number, since 1 + 211 + 12 + 321 + 121 = 666.

It is an interprime number because it is at equal distance from previous prime (121112321119) and next prime (121112321123).

It is not a de Polignac number, because 121112321121 - 2¹ = 121112321119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121112321094 and 121112321103.

It is not an unprimeable number, because it can be changed into a prime (121112321123) 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 19 ways as a sum of consecutive naturals, for example, 67963375 + ... + 67965156.

Almost surely, 2^121112321121 is an apocalyptic number.

121112321121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121112321121 is a deficient number, since it is larger than the sum of its proper divisors (76255907343).

121112321121 is a wasteful number, since it uses less digits than its factorization.

121112321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135928554 (or 135928545 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 121112321121 its reverse (121123211121), we get a palindrome (242235532242).

Subtracting 121112321121 from its reverse (121123211121), we obtain a square (10890000 = 3300²).

The spelling of 121112321121 in words is "one hundred twenty-one billion, one hundred twelve million, three hundred twenty-one thousand, one hundred twenty-one".