121221223 has 4 divisors (see below), whose sum is σ = 123275880. Its totient is φ = 119166568.

The previous prime is 121221209. The next prime is 121221227. The reversal of 121221223 is 322122121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322122121 = 1777 ⋅181273.

It is a cyclic number.

It is not a de Polignac number, because 121221223 - 2⁹ = 121220711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121221197 and 121221206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1027240 + ... + 1027357.

It is an arithmetic number, because the mean of its divisors is an integer number (30818970).

Almost surely, 2^121221223 is an apocalyptic number.

121221223 is a deficient number, since it is larger than the sum of its proper divisors (2054657).

121221223 is an equidigital number, since it uses as much as digits as its factorization.

121221223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054656.

The product of its digits is 96, while the sum is 16.

The square root of 121221223 is about 11010.0509989736. The cubic root of 121221223 is about 494.9099900957.

Adding to 121221223 its reverse (322122121), we get a palindrome (443343344).

The spelling of 121221223 in words is "one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-three".