121200121199 has 4 divisors (see below), whose sum is σ = 125109802560. Its totient is φ = 117290439840.

The previous prime is 121200121157. The next prime is 121200121219. The reversal of 121200121199 is 991121002121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121200121199 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 (121200121499) by changing a digit.

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, 1954840634 + ... + 1954840695.

It is an arithmetic number, because the mean of its divisors is an integer number (31277450640).

Almost surely, 2^121200121199 is an apocalyptic number.

121200121199 is a deficient number, since it is larger than the sum of its proper divisors (3909681361).

121200121199 is an equidigital number, since it uses as much as digits as its factorization.

121200121199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909681360.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 121200121199 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty-one thousand, one hundred ninety-nine".