121221220199 has 8 divisors (see below), whose sum is σ = 127605585840. Its totient is φ = 114837284736.

The previous prime is 121221220189. The next prime is 121221220213. The reversal of 121221220199 is 991022122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221220199 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 (121221220189) 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 7 ways as a sum of consecutive naturals, for example, 585437 + ... + 764969.

It is an arithmetic number, because the mean of its divisors is an integer number (15950698230).

Almost surely, 2^121221220199 is an apocalyptic number.

121221220199 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

121221220199 is a deficient number, since it is larger than the sum of its proper divisors (6384365641).

121221220199 is a wasteful number, since it uses less digits than its factorization.

121221220199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215089.

The product of its (nonzero) digits is 2592, while the sum is 32.

It can be divided in two parts, 12122 and 1220199, that added together give a palindrome (1232321).

The spelling of 121221220199 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, one hundred ninety-nine".