121755443257 has 8 divisors (see below), whose sum is σ = 139323675456. Its totient is φ = 104230860432.

The previous prime is 121755443213. The next prime is 121755443263. The reversal of 121755443257 is 752344557121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121755443257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121755443857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10906363 + ... + 10917520.

It is an arithmetic number, because the mean of its divisors is an integer number (17415459432).

Almost surely, 2^121755443257 is an apocalyptic number.

It is an amenable number.

121755443257 is a deficient number, since it is larger than the sum of its proper divisors (17568232199).

121755443257 is an equidigital number, since it uses as much as digits as its factorization.

121755443257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21824687.

The product of its digits is 1176000, while the sum is 46.

The spelling of 121755443257 in words is "one hundred twenty-one billion, seven hundred fifty-five million, four hundred forty-three thousand, two hundred fifty-seven".