121222209 has 4 divisors (see below), whose sum is σ = 161629616. Its totient is φ = 80814804.

The previous prime is 121222193. The next prime is 121222237. The reversal of 121222209 is 902222121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 902222121 = 3 ⋅300740707.

It is not a de Polignac number, because 121222209 - 2⁴ = 121222193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20203699 + ... + 20203704.

It is an arithmetic number, because the mean of its divisors is an integer number (40407404).

Almost surely, 2^121222209 is an apocalyptic number.

It is an amenable number.

121222209 is a deficient number, since it is larger than the sum of its proper divisors (40407407).

121222209 is an equidigital number, since it uses as much as digits as its factorization.

121222209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40407406.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 121222209 is about 11010.0957761502. The cubic root of 121222209 is about 494.9113319397.

It can be divided in two parts, 12 and 1222209, that added together give a palindrome (1222221).

The spelling of 121222209 in words is "one hundred twenty-one million, two hundred twenty-two thousand, two hundred nine".