121212440400 has 60 divisors (see below), whose sum is σ = 388283854592. Its totient is φ = 32323317120.

The previous prime is 121212440399. The next prime is 121212440417. The reversal of 121212440400 is 4044212121.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50503984 + ... + 50506383.

Almost surely, 2^121212440400 is an apocalyptic number.

121212440400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212440400 is an abundant number, since it is smaller than the sum of its proper divisors (267071414192).

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

121212440400 is a wasteful number, since it uses less digits than its factorization.

121212440400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101010388 (or 101010377 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 121212440400 its reverse (4044212121), we get a palindrome (125256652521).

The spelling of 121212440400 in words is "one hundred twenty-one billion, two hundred twelve million, four hundred forty thousand, four hundred".