121998195 has 48 divisors (see below), whose sum is σ = 232064352. Its totient is φ = 58798080.

The previous prime is 121998179. The next prime is 121998197. The reversal of 121998195 is 591899121.

It is not a de Polignac number, because 121998195 - 2⁴ = 121998179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 121998195.

It is not an unprimeable number, because it can be changed into a prime (121998197) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 94897 + ... + 96173.

It is an arithmetic number, because the mean of its divisors is an integer number (4834674).

Almost surely, 2^121998195 is an apocalyptic number.

121998195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121998195 is a deficient number, since it is larger than the sum of its proper divisors (110066157).

121998195 is a wasteful number, since it uses less digits than its factorization.

121998195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492 (or 1489 counting only the distinct ones).

The product of its digits is 58320, while the sum is 45.

The square root of 121998195 is about 11045.2793083742. The cubic root of 121998195 is about 495.9651204119.

The spelling of 121998195 in words is "one hundred twenty-one million, nine hundred ninety-eight thousand, one hundred ninety-five".