121212342400 has 96 divisors (see below), whose sum is σ = 300150320400. Its totient is φ = 48368686080.

The previous prime is 121212342337. The next prime is 121212342401. The reversal of 121212342400 is 4243212121.

It is not an unprimeable number, because it can be changed into a prime (121212342401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1295599 + ... + 1386001.

Almost surely, 2^121212342400 is an apocalyptic number.

121212342400 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 121212342400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150075160200).

121212342400 is an abundant number, since it is smaller than the sum of its proper divisors (178937978000).

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

121212342400 is an equidigital number, since it uses as much as digits as its factorization.

121212342400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90846 (or 90829 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 121212342400 its reverse (4243212121), we get a palindrome (125455554521).

The spelling of 121212342400 in words is "one hundred twenty-one billion, two hundred twelve million, three hundred forty-two thousand, four hundred".