121197998 has 32 divisors (see below), whose sum is σ = 204042240. Its totient is φ = 53654400.

The previous prime is 121197997. The next prime is 121198001. The reversal of 121197998 is 899791121.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121197997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104723 + ... + 105873.

It is an arithmetic number, because the mean of its divisors is an integer number (6376320).

Almost surely, 2^121197998 is an apocalyptic number.

121197998 is a deficient number, since it is larger than the sum of its proper divisors (82844242).

121197998 is a wasteful number, since it uses less digits than its factorization.

121197998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352.

The product of its digits is 81648, while the sum is 47.

The square root of 121197998 is about 11008.9962303563. The cubic root of 121197998 is about 494.8783811678.

The spelling of 121197998 in words is "one hundred twenty-one million, one hundred ninety-seven thousand, nine hundred ninety-eight".