121551324400 has 180 divisors, whose sum is σ = 321545810376. Its totient is φ = 44123763200.

The previous prime is 121551324371. The next prime is 121551324431. The reversal of 121551324400 is 4423155121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 33055362 + ... + 33059038.

Almost surely, 2^121551324400 is an apocalyptic number.

121551324400 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 121551324400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160772905188).

121551324400 is an abundant number, since it is smaller than the sum of its proper divisors (199994485976).

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

121551324400 is a wasteful number, since it uses less digits than its factorization.

121551324400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4400 (or 4378 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 121551324400 its reverse (4423155121), we get a palindrome (125974479521).

The spelling of 121551324400 in words is "one hundred twenty-one billion, five hundred fifty-one million, three hundred twenty-four thousand, four hundred".