121755720755 has 8 divisors (see below), whose sum is σ = 146605524912. Its totient is φ = 97072136608.

The previous prime is 121755720707. The next prime is 121755720763. The reversal of 121755720755 is 557027557121.

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

It is a cyclic number.

It is not a de Polignac number, because 121755720755 - 2²² = 121751526451 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41553389 + ... + 41556318.

It is an arithmetic number, because the mean of its divisors is an integer number (18325690614).

Almost surely, 2^121755720755 is an apocalyptic number.

121755720755 is a deficient number, since it is larger than the sum of its proper divisors (24849804157).

121755720755 is an equidigital number, since it uses as much as digits as its factorization.

121755720755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83110005.

The product of its (nonzero) digits is 857500, while the sum is 47.

The spelling of 121755720755 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred twenty thousand, seven hundred fifty-five".