121553055 has 40 divisors (see below), whose sum is σ = 234666432. Its totient is φ = 59838912.

The previous prime is 121553041. The next prime is 121553149. The reversal of 121553055 is 550355121.

121553055 is a `hidden beast` number, since 121 + 5 + 530 + 5 + 5 = 666.

It is not a de Polignac number, because 121553055 - 2⁵ = 121553023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6279 + ... + 16808.

Almost surely, 2^121553055 is an apocalyptic number.

121553055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121553055 is a deficient number, since it is larger than the sum of its proper divisors (113113377).

121553055 is a wasteful number, since it uses less digits than its factorization.

121553055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23117 (or 23108 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 121553055 is about 11025.1102035308. The cubic root of 121553055 is about 495.3611689216.

The spelling of 121553055 in words is "one hundred twenty-one million, five hundred fifty-three thousand, fifty-five".