121730055 has 32 divisors (see below), whose sum is σ = 207863040. Its totient is φ = 60652800.

The previous prime is 121730051. The next prime is 121730057. The reversal of 121730055 is 550037121.

It is not a de Polignac number, because 121730055 - 2² = 121730051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121730051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17880 + ... + 23730.

It is an arithmetic number, because the mean of its divisors is an integer number (6495720).

Almost surely, 2^121730055 is an apocalyptic number.

121730055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121730055 is a deficient number, since it is larger than the sum of its proper divisors (86132985).

121730055 is a wasteful number, since it uses less digits than its factorization.

121730055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5951.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 121730055 is about 11033.1344141182. The cubic root of 121730055 is about 495.6014930700.

Adding to 121730055 its reverse (550037121), we get a palindrome (671767176).

The spelling of 121730055 in words is "one hundred twenty-one million, seven hundred thirty thousand, fifty-five".