121506520 has 128 divisors (see below), whose sum is σ = 307800000. Its totient is φ = 42964992.

The previous prime is 121506481. The next prime is 121506521. The reversal of 121506520 is 25605121.

It is a junction number, because it is equal to n+sod(n) for n = 121506491 and 121506500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121506521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 815406 + ... + 815554.

Almost surely, 2^121506520 is an apocalyptic number.

121506520 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 121506520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153900000).

121506520 is an abundant number, since it is smaller than the sum of its proper divisors (186293480).

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

121506520 is a wasteful number, since it uses less digits than its factorization.

121506520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 121506520 is about 11022.9995917627. Note that the first 3 decimals coincide. The cubic root of 121506520 is about 495.2979466678.

The spelling of 121506520 in words is "one hundred twenty-one million, five hundred six thousand, five hundred twenty".