121515355 has 32 divisors (see below), whose sum is σ = 168114240. Its totient is φ = 83566080.

The previous prime is 121515347. The next prime is 121515367. The reversal of 121515355 is 553515121.

It is not a de Polignac number, because 121515355 - 2³ = 121515347 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 74529 + ... + 76141.

It is an arithmetic number, because the mean of its divisors is an integer number (5253570).

Almost surely, 2^121515355 is an apocalyptic number.

121515355 is a deficient number, since it is larger than the sum of its proper divisors (46598885).

121515355 is a wasteful number, since it uses less digits than its factorization.

121515355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711.

The product of its digits is 3750, while the sum is 28.

The square root of 121515355 is about 11023.4003374639. The cubic root of 121515355 is about 495.3099511026.

The spelling of 121515355 in words is "one hundred twenty-one million, five hundred fifteen thousand, three hundred fifty-five".