121755771441 has 6 divisors (see below), whose sum is σ = 175869447650. Its totient is φ = 81170514288.

The previous prime is 121755771427. The next prime is 121755771479. The reversal of 121755771441 is 144177557121.

121755771441 is a `hidden beast` number, since 1 + 2 + 1 + 75 + 577 + 1 + 4 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 115246670400 + 6509101041 = 339480^2 + 80679^2 .

It is not a de Polignac number, because 121755771441 - 2¹⁹ = 121755247153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121755771341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6764209516 + ... + 6764209533.

Almost surely, 2^121755771441 is an apocalyptic number.

It is an amenable number.

121755771441 is a deficient number, since it is larger than the sum of its proper divisors (54113676209).

121755771441 is a wasteful number, since it uses less digits than its factorization.

121755771441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13528419055 (or 13528419052 counting only the distinct ones).

The product of its digits is 274400, while the sum is 45.

The spelling of 121755771441 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred seventy-one thousand, four hundred forty-one".