121810307 has 4 divisors (see below), whose sum is σ = 121923456. Its totient is φ = 121697160.

The previous prime is 121810217. The next prime is 121810313. The reversal of 121810307 is 703018121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 703018121 = 13 ⋅54078317.

It is a cyclic number.

It is not a de Polignac number, because 121810307 - 2¹² = 121806211 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121810607) 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, 54944 + ... + 57117.

It is an arithmetic number, because the mean of its divisors is an integer number (30480864).

Almost surely, 2^121810307 is an apocalyptic number.

121810307 is a deficient number, since it is larger than the sum of its proper divisors (113149).

121810307 is a wasteful number, since it uses less digits than its factorization.

121810307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113148.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 121810307 is about 11036.7706780561. The cubic root of 121810307 is about 495.7103795564.

Adding to 121810307 its reverse (703018121), we get a palindrome (824828428).

The spelling of 121810307 in words is "one hundred twenty-one million, eight hundred ten thousand, three hundred seven".