121303331100 has 216 divisors, whose sum is σ = 444641957760. Its totient is φ = 27081613440.

The previous prime is 121303331089. The next prime is 121303331161. The reversal of 121303331100 is 1133303121.

It is a happy number.

121303331100 is a `hidden beast` number, since 1 + 21 + 303 + 331 + 10 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 47011 + ... + 494789.

Almost surely, 2^121303331100 is an apocalyptic number.

121303331100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121303331100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222320978880).

121303331100 is an abundant number, since it is smaller than the sum of its proper divisors (323338626660).

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

121303331100 is a wasteful number, since it uses less digits than its factorization.

121303331100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447849 (or 447839 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 121303331100 its reverse (1133303121), we get a palindrome (122436634221).

The spelling of 121303331100 in words is "one hundred twenty-one billion, three hundred three million, three hundred thirty-one thousand, one hundred".