121504520 has 16 divisors (see below), whose sum is σ = 273385260. Its totient is φ = 48601792.

The previous prime is 121504489. The next prime is 121504543. The reversal of 121504520 is 25405121.

It can be written as a sum of positive squares in 2 ways, for example, as 120516484 + 988036 = 10978^2 + 994^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121504492 and 121504501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518767 + ... + 1518846.

Almost surely, 2^121504520 is an apocalyptic number.

121504520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121504520 is an abundant number, since it is smaller than the sum of its proper divisors (151880740).

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

121504520 is a wasteful number, since it uses less digits than its factorization.

121504520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037624 (or 3037620 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 121504520 is about 11022.9088719811. The cubic root of 121504520 is about 495.2952291145.

Adding to 121504520 its reverse (25405121), we get a palindrome (146909641).

The spelling of 121504520 in words is "one hundred twenty-one million, five hundred four thousand, five hundred twenty".