121501855 has 4 divisors (see below), whose sum is σ = 145802232. Its totient is φ = 97201480.

The previous prime is 121501841. The next prime is 121501859. The reversal of 121501855 is 558105121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121501855 - 2⁵ = 121501823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121501859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12150181 + ... + 12150190.

It is an arithmetic number, because the mean of its divisors is an integer number (36450558).

Almost surely, 2^121501855 is an apocalyptic number.

121501855 is a deficient number, since it is larger than the sum of its proper divisors (24300377).

121501855 is an equidigital number, since it uses as much as digits as its factorization.

121501855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24300376.

The product of its (nonzero) digits is 2000, while the sum is 28.

The square root of 121501855 is about 11022.7879867119. The cubic root of 121501855 is about 495.2916079284.

Adding to 121501855 its reverse (558105121), we get a palindrome (679606976).

The spelling of 121501855 in words is "one hundred twenty-one million, five hundred one thousand, eight hundred fifty-five".