121515328 has 28 divisors (see below), whose sum is σ = 263054592. Its totient is φ = 55233920.

The previous prime is 121515323. The next prime is 121515347. The reversal of 121515328 is 823515121.

It is a junction number, because it is equal to n+sod(n) for n = 121515296 and 121515305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121515323) 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 3 ways as a sum of consecutive naturals, for example, 85600 + ... + 87007.

Almost surely, 2^121515328 is an apocalyptic number.

It is an amenable number.

121515328 is an abundant number, since it is smaller than the sum of its proper divisors (141539264).

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

121515328 is a wasteful number, since it uses less digits than its factorization.

121515328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172630 (or 172620 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 121515328 is about 11023.3991127964. The cubic root of 121515328 is about 495.3099144176.

The spelling of 121515328 in words is "one hundred twenty-one million, five hundred fifteen thousand, three hundred twenty-eight".