121540305 has 32 divisors (see below), whose sum is σ = 207682560. Its totient is φ = 60560640.

The previous prime is 121540291. The next prime is 121540313. The reversal of 121540305 is 503045121.

It is not a de Polignac number, because 121540305 - 2⁵ = 121540273 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8979 + ... + 17991.

It is an arithmetic number, because the mean of its divisors is an integer number (6490080).

Almost surely, 2^121540305 is an apocalyptic number.

121540305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121540305 is a deficient number, since it is larger than the sum of its proper divisors (86142255).

121540305 is a wasteful number, since it uses less digits than its factorization.

121540305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9081.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 121540305 is about 11024.5319628545. The cubic root of 121540305 is about 495.3438484307.

Adding to 121540305 its reverse (503045121), we get a palindrome (624585426).

The spelling of 121540305 in words is "one hundred twenty-one million, five hundred forty thousand, three hundred five".