121330155 has 16 divisors (see below), whose sum is σ = 194835744. Its totient is φ = 64473600.

The previous prime is 121330151. The next prime is 121330163. The reversal of 121330155 is 551033121.

It is not a de Polignac number, because 121330155 - 2² = 121330151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121330151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10446 + ... + 18755.

It is an arithmetic number, because the mean of its divisors is an integer number (12177234).

Almost surely, 2^121330155 is an apocalyptic number.

121330155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121330155 is a deficient number, since it is larger than the sum of its proper divisors (73505589).

121330155 is a wasteful number, since it uses less digits than its factorization.

121330155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29486.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 121330155 is about 11014.9968225143. The cubic root of 121330155 is about 495.0581913019.

Adding to 121330155 its reverse (551033121), we get a palindrome (672363276).

The spelling of 121330155 in words is "one hundred twenty-one million, three hundred thirty thousand, one hundred fifty-five".