121515020 has 24 divisors (see below), whose sum is σ = 278380368. Its totient is φ = 44187200.

The previous prime is 121515007. The next prime is 121515029. The reversal of 121515020 is 20515121.

It is a self number, because there is not a number n which added to its sum of digits gives 121515020.

It is not an unprimeable number, because it can be changed into a prime (121515029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275951 + ... + 276390.

It is an arithmetic number, because the mean of its divisors is an integer number (11599182).

Almost surely, 2^121515020 is an apocalyptic number.

121515020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121515020 is an abundant number, since it is smaller than the sum of its proper divisors (156865348).

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

121515020 is a wasteful number, since it uses less digits than its factorization.

121515020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552361 (or 552359 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 121515020 is about 11023.3851425050. The cubic root of 121515020 is about 495.3094959366.

It can be divided in two parts, 12151 and 5020, that added together give a palindrome (17171).

The spelling of 121515020 in words is "one hundred twenty-one million, five hundred fifteen thousand, twenty".