121306305 has 24 divisors (see below), whose sum is σ = 206186112. Its totient is φ = 60888832.

The previous prime is 121306267. The next prime is 121306307. The reversal of 121306305 is 503603121.

It is not a de Polignac number, because 121306305 - 2¹⁴ = 121289921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121306307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9657 + ... + 18326.

It is an arithmetic number, because the mean of its divisors is an integer number (8591088).

Almost surely, 2^121306305 is an apocalyptic number.

121306305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121306305 is a deficient number, since it is larger than the sum of its proper divisors (84879807).

121306305 is a wasteful number, since it uses less digits than its factorization.

121306305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28025 (or 28008 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 121306305 is about 11013.9141543776. The cubic root of 121306305 is about 495.0257511346.

Adding to 121306305 its reverse (503603121), we get a palindrome (624909426).

The spelling of 121306305 in words is "one hundred twenty-one million, three hundred six thousand, three hundred five".