121689759742 has 8 divisors (see below), whose sum is σ = 182536150896. Its totient is φ = 60844376112.

The previous prime is 121689759707. The next prime is 121689759749. The reversal of 121689759742 is 247957986121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121689759749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250378 + ... + 553234.

It is an arithmetic number, because the mean of its divisors is an integer number (22817018862).

Almost surely, 2^121689759742 is an apocalyptic number.

121689759742 is a deficient number, since it is larger than the sum of its proper divisors (60846391154).

121689759742 is a wasteful number, since it uses less digits than its factorization.

121689759742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503762.

The product of its digits is 15240960, while the sum is 61.

The spelling of 121689759742 in words is "one hundred twenty-one billion, six hundred eighty-nine million, seven hundred fifty-nine thousand, seven hundred forty-two".