12121312331100 has 144 divisors (see below), whose sum is σ = 42190673235200. Its totient is φ = 2624765368320.

The previous prime is 12121312331057. The next prime is 12121312331101. The reversal of 12121312331100 is 113321312121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121312331101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 151856245 + ... + 151936044.

Almost surely, 2^{12121312331100} is an apocalyptic number.

12121312331100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121312331100 is an abundant number, since it is smaller than the sum of its proper divisors (30069360904100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12121312331100 is a wasteful number, since it uses less digits than its factorization.

12121312331100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303792332 (or 303792325 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 12121312331100 its reverse (113321312121), we get a palindrome (12234633643221).

The spelling of 12121312331100 in words is "twelve trillion, one hundred twenty-one billion, three hundred twelve million, three hundred thirty-one thousand, one hundred".