121755742445 has 32 divisors (see below), whose sum is σ = 152363068416. Its totient is φ = 93299673600.

The previous prime is 121755742441. The next prime is 121755742457. The reversal of 121755742445 is 544247557121.

It is not a de Polignac number, because 121755742445 - 2² = 121755742441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121755742445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121755742441) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 24559907 + ... + 24564863.

It is an arithmetic number, because the mean of its divisors is an integer number (4761345888).

Almost surely, 2^121755742445 is an apocalyptic number.

It is an amenable number.

121755742445 is a deficient number, since it is larger than the sum of its proper divisors (30607325971).

121755742445 is a wasteful number, since it uses less digits than its factorization.

121755742445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6581.

The product of its digits is 1568000, while the sum is 47.

The spelling of 121755742445 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred forty-two thousand, four hundred forty-five".