121506540 has 24 divisors (see below), whose sum is σ = 340218480. Its totient is φ = 32401728.

The previous prime is 121506521. The next prime is 121506563. The reversal of 121506540 is 45605121.

It is a self number, because there is not a number n which added to its sum of digits gives 121506540.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1012495 + ... + 1012614.

It is an arithmetic number, because the mean of its divisors is an integer number (14175770).

Almost surely, 2^121506540 is an apocalyptic number.

121506540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121506540 is an abundant number, since it is smaller than the sum of its proper divisors (218711940).

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

121506540 is a wasteful number, since it uses less digits than its factorization.

121506540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025121 (or 2025119 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 121506540 is about 11023.0004989567. Note that the first 3 decimals coincide. The cubic root of 121506540 is about 495.2979738431.

The spelling of 121506540 in words is "one hundred twenty-one million, five hundred six thousand, five hundred forty".