121730257 has 4 divisors (see below), whose sum is σ = 132796656. Its totient is φ = 110663860.

The previous prime is 121730249. The next prime is 121730263. The reversal of 121730257 is 752037121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121730257 - 2³ = 121730249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121730057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5533183 + ... + 5533204.

It is an arithmetic number, because the mean of its divisors is an integer number (33199164).

Almost surely, 2^121730257 is an apocalyptic number.

It is an amenable number.

121730257 is a deficient number, since it is larger than the sum of its proper divisors (11066399).

121730257 is a wasteful number, since it uses less digits than its factorization.

121730257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11066398.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 121730257 is about 11033.1435683580. The cubic root of 121730257 is about 495.6017672051.

Adding to 121730257 its reverse (752037121), we get a palindrome (873767378).

The spelling of 121730257 in words is "one hundred twenty-one million, seven hundred thirty thousand, two hundred fifty-seven".