121197999 has 16 divisors (see below), whose sum is σ = 174454112. Its totient is φ = 74400768.

The previous prime is 121197997. The next prime is 121198001. The reversal of 121197999 is 999791121.

It is an interprime number because it is at equal distance from previous prime (121197997) and next prime (121198001).

It is not a de Polignac number, because 121197999 - 2¹ = 121197997 is a prime.

It is a Duffinian 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13299 + ... + 20475.

It is an arithmetic number, because the mean of its divisors is an integer number (10903382).

Almost surely, 2^121197999 is an apocalyptic number.

121197999 is a deficient number, since it is larger than the sum of its proper divisors (53256113).

121197999 is a wasteful number, since it uses less digits than its factorization.

121197999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7626.

The product of its digits is 91854, while the sum is 48.

The square root of 121197999 is about 11008.9962757737. The cubic root of 121197999 is about 494.8783825289.

The spelling of 121197999 in words is "one hundred twenty-one million, one hundred ninety-seven thousand, nine hundred ninety-nine".