121689898 has 8 divisors (see below), whose sum is σ = 199128960. Its totient is φ = 55313580.

The previous prime is 121689863. The next prime is 121689901. The reversal of 121689898 is 898986121.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2765658 + ... + 2765701.

It is an arithmetic number, because the mean of its divisors is an integer number (24891120).

Almost surely, 2^121689898 is an apocalyptic number.

121689898 is a deficient number, since it is larger than the sum of its proper divisors (77439062).

121689898 is a wasteful number, since it uses less digits than its factorization.

121689898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5531372.

The product of its digits is 497664, while the sum is 52.

The square root of 121689898 is about 11031.3144275739. The cubic root of 121689898 is about 495.5469898004.

The spelling of 121689898 in words is "one hundred twenty-one million, six hundred eighty-nine thousand, eight hundred ninety-eight".