121821056198 has 8 divisors (see below), whose sum is σ = 183127966560. Its totient is φ = 60778400680.

The previous prime is 121821056113. The next prime is 121821056213. The reversal of 121821056198 is 891650128121.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 66062558 + ... + 66064401.

It is an arithmetic number, because the mean of its divisors is an integer number (22890995820).

Almost surely, 2^121821056198 is an apocalyptic number.

121821056198 is a deficient number, since it is larger than the sum of its proper divisors (61306910362).

121821056198 is a wasteful number, since it uses less digits than its factorization.

121821056198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132127422.

The product of its (nonzero) digits is 69120, while the sum is 44.

The spelling of 121821056198 in words is "one hundred twenty-one billion, eight hundred twenty-one million, fifty-six thousand, one hundred ninety-eight".