121800611 has 4 divisors (see below), whose sum is σ = 121825752. Its totient is φ = 121775472.

The previous prime is 121800587. The next prime is 121800619. The reversal of 121800611 is 116008121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116008121 = 821 ⋅141301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121800611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121800619) 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, 2741 + ... + 15846.

It is an arithmetic number, because the mean of its divisors is an integer number (30456438).

Almost surely, 2^121800611 is an apocalyptic number.

121800611 is a deficient number, since it is larger than the sum of its proper divisors (25141).

121800611 is an equidigital number, since it uses as much as digits as its factorization.

121800611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25140.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 121800611 is about 11036.3314103918. The cubic root of 121800611 is about 495.6972264949.

Adding to 121800611 its reverse (116008121), we get a palindrome (237808732).

The spelling of 121800611 in words is "one hundred twenty-one million, eight hundred thousand, six hundred eleven".