121543430320 has 40 divisors (see below), whose sum is σ = 304326053136. Its totient is φ = 44877573888.

The previous prime is 121543430317. The next prime is 121543430321. The reversal of 121543430320 is 23034345121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (121543430321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58433302 + ... + 58435381.

Almost surely, 2^121543430320 is an apocalyptic number.

121543430320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121543430320 is an abundant number, since it is smaller than the sum of its proper divisors (182782622816).

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

121543430320 is a wasteful number, since it uses less digits than its factorization.

121543430320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116868709 (or 116868703 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 121543430320 its reverse (23034345121), we get a palindrome (144577775441).

The spelling of 121543430320 in words is "one hundred twenty-one billion, five hundred forty-three million, four hundred thirty thousand, three hundred twenty".