121504155 has 16 divisors (see below), whose sum is σ = 194745600. Its totient is φ = 64689248.

The previous prime is 121504127. The next prime is 121504157. The reversal of 121504155 is 551405121.

It is a cyclic number.

It is not a de Polignac number, because 121504155 - 2⁶ = 121504091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121504157) 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, 2224 + ... + 15746.

It is an arithmetic number, because the mean of its divisors is an integer number (12171600).

Almost surely, 2^121504155 is an apocalyptic number.

121504155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121504155 is a deficient number, since it is larger than the sum of its proper divisors (73241445).

121504155 is a wasteful number, since it uses less digits than its factorization.

121504155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14130.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 121504155 is about 11022.8923155404. The cubic root of 121504155 is about 495.2947331578.

Adding to 121504155 its reverse (551405121), we get a palindrome (672909276).

The spelling of 121504155 in words is "one hundred twenty-one million, five hundred four thousand, one hundred fifty-five".