121755721106 has 8 divisors (see below), whose sum is σ = 182665634124. Its totient is φ = 60867176400.

The previous prime is 121755721103. The next prime is 121755721127. The reversal of 121755721106 is 601127557121.

121755721106 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 119975640625 + 1780080481 = 346375^2 + 42191^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 121755721106.

It is not an unprimeable number, because it can be changed into a prime (121755721103) 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 3 ways as a sum of consecutive naturals, for example, 5327825 + ... + 5350628.

Almost surely, 2^121755721106 is an apocalyptic number.

121755721106 is a deficient number, since it is larger than the sum of its proper divisors (60909913018).

121755721106 is a wasteful number, since it uses less digits than its factorization.

121755721106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10684156.

The product of its (nonzero) digits is 29400, while the sum is 38.

The spelling of 121755721106 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred twenty-one thousand, one hundred six".