121115520 has 256 divisors, whose sum is σ = 441619200. Its totient is φ = 31352832.

The previous prime is 121115503. The next prime is 121115549. The reversal of 121115520 is 25511121.

121115520 is a `hidden beast` number, since 1 + 2 + 111 + 552 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121115493 and 121115502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 742959 + ... + 743121.

It is an arithmetic number, because the mean of its divisors is an integer number (1725075).

Almost surely, 2^121115520 is an apocalyptic number.

121115520 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 121115520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220809600).

121115520 is an abundant number, since it is smaller than the sum of its proper divisors (320503680).

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

121115520 is a wasteful number, since it uses less digits than its factorization.

121115520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 121115520 is about 11005.2496564140. The cubic root of 121115520 is about 494.7660970208.

Adding to 121115520 its reverse (25511121), we get a palindrome (146626641).

The spelling of 121115520 in words is "one hundred twenty-one million, one hundred fifteen thousand, five hundred twenty".