121866336400 has 60 divisors (see below), whose sum is σ = 292896378432. Its totient is φ = 48727803520.

The previous prime is 121866336377. The next prime is 121866336407. The reversal of 121866336400 is 4633668121.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (121866336407) 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 11 ways as a sum of consecutive naturals, for example, 1007997 + ... + 1122403.

Almost surely, 2^121866336400 is an apocalyptic number.

121866336400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121866336400 is an abundant number, since it is smaller than the sum of its proper divisors (171030042032).

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

121866336400 is a wasteful number, since it uses less digits than its factorization.

121866336400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117088 (or 117077 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 121866336400 in words is "one hundred twenty-one billion, eight hundred sixty-six million, three hundred thirty-six thousand, four hundred".