121223221 has 8 divisors (see below), whose sum is σ = 139152960. Its totient is φ = 103446528.

The previous prime is 121223213. The next prime is 121223227. The reversal of 121223221 is 122322121.

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 121223221 - 2³ = 121223213 is a prime.

It is a super-2 number, since 2×121223221² = 29390138619229682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121223195 and 121223204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121223227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36556 + ... + 39733.

It is an arithmetic number, because the mean of its divisors is an integer number (17394120).

Almost surely, 2^121223221 is an apocalyptic number.

It is an amenable number.

121223221 is a deficient number, since it is larger than the sum of its proper divisors (17929739).

121223221 is an equidigital number, since it uses as much as digits as its factorization.

121223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76523.

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

The square root of 121223221 is about 11010.1417338743. The cubic root of 121223221 is about 494.9127091595.

Adding to 121223221 its reverse (122322121), we get a palindrome (243545342).

The spelling of 121223221 in words is "one hundred twenty-one million, two hundred twenty-three thousand, two hundred twenty-one".