121224454878 has 8 divisors (see below), whose sum is σ = 242448909768. Its totient is φ = 40408151624.

The previous prime is 121224454853. The next prime is 121224454907. The reversal of 121224454878 is 878454422121.

It is a sphenic number, since it is the product of 3 distinct primes.

121224454878 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10102037901 + ... + 10102037912.

It is an arithmetic number, because the mean of its divisors is an integer number (30306113721).

Almost surely, 2^121224454878 is an apocalyptic number.

121224454878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121224454878 is a wasteful number, since it uses less digits than its factorization.

121224454878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20204075818.

The product of its digits is 1146880, while the sum is 48.

Adding to 121224454878 its reverse (878454422121), we get a palindrome (999678876999).

The spelling of 121224454878 in words is "one hundred twenty-one billion, two hundred twenty-four million, four hundred fifty-four thousand, eight hundred seventy-eight".