121500255 has 16 divisors (see below), whose sum is σ = 195412320. Its totient is φ = 64462848.

The previous prime is 121500167. The next prime is 121500263. The reversal of 121500255 is 552005121.

It is not a de Polignac number, because 121500255 - 2¹² = 121496159 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18090 + ... + 23879.

It is an arithmetic number, because the mean of its divisors is an integer number (12213270).

Almost surely, 2^121500255 is an apocalyptic number.

121500255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121500255 is a deficient number, since it is larger than the sum of its proper divisors (73912065).

121500255 is a wasteful number, since it uses less digits than its factorization.

121500255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42170.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 121500255 is about 11022.7154095531. The cubic root of 121500255 is about 495.2894338325.

Adding to 121500255 its reverse (552005121), we get a palindrome (673505376).

The spelling of 121500255 in words is "one hundred twenty-one million, five hundred thousand, two hundred fifty-five".