121836198 has 64 divisors (see below), whose sum is σ = 281014272. Its totient is φ = 34853280.

The previous prime is 121836193. The next prime is 121836223. The reversal of 121836198 is 891638121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121836191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125511 + ... + 126477.

It is an arithmetic number, because the mean of its divisors is an integer number (4390848).

Almost surely, 2^121836198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121836198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140507136).

121836198 is an abundant number, since it is smaller than the sum of its proper divisors (159178074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121836198 is a wasteful number, since it uses less digits than its factorization.

121836198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089.

The product of its digits is 20736, while the sum is 39.

The square root of 121836198 is about 11037.9435584714. The cubic root of 121836198 is about 495.7454984461.

It can be divided in two parts, 12183 and 6198, that added together give a palindrome (18381).

The spelling of 121836198 in words is "one hundred twenty-one million, eight hundred thirty-six thousand, one hundred ninety-eight".