121321123100 has 18 divisors (see below), whose sum is σ = 263266837344. Its totient is φ = 48528449200.

The previous prime is 121321123057. The next prime is 121321123109. The reversal of 121321123100 is 1321123121.

121321123100 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×121321123100² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321123109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 606605516 + ... + 606605715.

It is an arithmetic number, because the mean of its divisors is an integer number (14625935408).

Almost surely, 2^121321123100 is an apocalyptic number.

121321123100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121321123100 is an abundant number, since it is smaller than the sum of its proper divisors (141945714244).

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

121321123100 is a wasteful number, since it uses less digits than its factorization.

121321123100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213211245 (or 1213211238 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 121321123100 its reverse (1321123121), we get a palindrome (122642246221).

The spelling of 121321123100 in words is "one hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred".