121240520 has 64 divisors (see below), whose sum is σ = 291556800. Its totient is φ = 45239040.

The previous prime is 121240513. The next prime is 121240529. The reversal of 121240520 is 25042121.

It is not an unprimeable number, because it can be changed into a prime (121240529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49730 + ... + 52110.

It is an arithmetic number, because the mean of its divisors is an integer number (4555575).

Almost surely, 2^121240520 is an apocalyptic number.

121240520 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 121240520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145778400).

121240520 is an abundant number, since it is smaller than the sum of its proper divisors (170316280).

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

121240520 is a wasteful number, since it uses less digits than its factorization.

121240520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478 (or 2474 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 121240520 is about 11010.9272997328. The cubic root of 121240520 is about 494.9362499951.

Adding to 121240520 its reverse (25042121), we get a palindrome (146282641).

The spelling of 121240520 in words is "one hundred twenty-one million, two hundred forty thousand, five hundred twenty".