121520224008 has 96 divisors (see below), whose sum is σ = 342178200000. Its totient is φ = 38913291648.

The previous prime is 121520223983. The next prime is 121520224039. The reversal of 121520224008 is 800422025121.

121520224008 is a `hidden beast` number, since 1 + 215 + 20 + 22 + 400 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269283 + ... + 561741.

It is an arithmetic number, because the mean of its divisors is an integer number (3564356250).

Almost surely, 2^121520224008 is an apocalyptic number.

121520224008 is a gapful number since it is divisible by the number (18) 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 121520224008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171089100000).

121520224008 is an abundant number, since it is smaller than the sum of its proper divisors (220657975992).

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

121520224008 is a wasteful number, since it uses less digits than its factorization.

121520224008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292699 (or 292692 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

Adding to 121520224008 its reverse (800422025121), we get a palindrome (921942249129).

The spelling of 121520224008 in words is "one hundred twenty-one billion, five hundred twenty million, two hundred twenty-four thousand, eight".