121220219 has 8 divisors (see below), whose sum is σ = 123222528. Its totient is φ = 119223720.

The previous prime is 121220213. The next prime is 121220243. The reversal of 121220219 is 912022121.

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 121220219 - 2⁸ = 121219963 is a prime.

It is a super-2 number, since 2×121220219² = 29388682988815922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220219.

It is not an unprimeable number, because it can be changed into a prime (121220213) 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, 63854 + ... + 65724.

It is an arithmetic number, because the mean of its divisors is an integer number (15402816).

Almost surely, 2^121220219 is an apocalyptic number.

121220219 is a deficient number, since it is larger than the sum of its proper divisors (2002309).

121220219 is an equidigital number, since it uses as much as digits as its factorization.

121220219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 121220219 is about 11010.0054041767. The cubic root of 121220219 is about 494.9086237480.

The spelling of 121220219 in words is "one hundred twenty-one million, two hundred twenty thousand, two hundred nineteen".