121302221 has 4 divisors (see below), whose sum is σ = 123290844. Its totient is φ = 119313600.

The previous prime is 121302197. The next prime is 121302229. The reversal of 121302221 is 122203121.

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: 122203121 = 179 ⋅682699.

It can be written as a sum of positive squares in 2 ways, for example, as 57078025 + 64224196 = 7555^2 + 8014^2 .

It is a cyclic number.

It is not a de Polignac number, because 121302221 - 2¹⁰ = 121301197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121302196 and 121302205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121302229) 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 3 ways as a sum of consecutive naturals, for example, 994220 + ... + 994341.

It is an arithmetic number, because the mean of its divisors is an integer number (30822711).

Almost surely, 2^121302221 is an apocalyptic number.

It is an amenable number.

121302221 is a deficient number, since it is larger than the sum of its proper divisors (1988623).

121302221 is an equidigital number, since it uses as much as digits as its factorization.

121302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988622.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 121302221 is about 11013.7287509726. The cubic root of 121302221 is about 495.0201957546.

Adding to 121302221 its reverse (122203121), we get a palindrome (243505342).

The spelling of 121302221 in words is "one hundred twenty-one million, three hundred two thousand, two hundred twenty-one".