121200221 has 8 divisors (see below), whose sum is σ = 129328320. Its totient is φ = 113247072.

The previous prime is 121200181. The next prime is 121200227. The reversal of 121200221 is 122002121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121200221 - 2²⁶ = 54091357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200227) 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 7 ways as a sum of consecutive naturals, for example, 42305 + ... + 45078.

It is an arithmetic number, because the mean of its divisors is an integer number (16166040).

Almost surely, 2^121200221 is an apocalyptic number.

It is an amenable number.

121200221 is a deficient number, since it is larger than the sum of its proper divisors (8128099).

121200221 is an equidigital number, since it uses as much as digits as its factorization.

121200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87475.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 121200221 is about 11009.0971927765. The cubic root of 121200221 is about 494.8814068172.

Adding to 121200221 its reverse (122002121), we get a palindrome (243202342).

The spelling of 121200221 in words is "one hundred twenty-one million, two hundred thousand, two hundred twenty-one".