121432550100 has 72 divisors (see below), whose sum is σ = 351773505888. Its totient is φ = 32342505600.

The previous prime is 121432550069. The next prime is 121432550101. The reversal of 121432550100 is 1055234121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121432550101) 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 23 ways as a sum of consecutive naturals, for example, 214 + ... + 492813.

Almost surely, 2^121432550100 is an apocalyptic number.

121432550100 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 121432550100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175886752944).

121432550100 is an abundant number, since it is smaller than the sum of its proper divisors (230340955788).

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

121432550100 is a wasteful number, since it uses less digits than its factorization.

121432550100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493865 (or 493858 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 121432550100 its reverse (1055234121), we get a palindrome (122487784221).

The spelling of 121432550100 in words is "one hundred twenty-one billion, four hundred thirty-two million, five hundred fifty thousand, one hundred".