121222105 has 4 divisors (see below), whose sum is σ = 145466532. Its totient is φ = 96977680.

The previous prime is 121222099. The next prime is 121222133. The reversal of 121222105 is 501222121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30382144 + 90839961 = 5512^2 + 9531^2 .

It is not a de Polignac number, because 121222105 - 2³ = 121222097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 12122206 + ... + 12122215.

It is an arithmetic number, because the mean of its divisors is an integer number (36366633).

Almost surely, 2^121222105 is an apocalyptic number.

It is an amenable number.

121222105 is a deficient number, since it is larger than the sum of its proper divisors (24244427).

121222105 is an equidigital number, since it uses as much as digits as its factorization.

121222105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24244426.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 121222105 is about 11010.0910532111. The cubic root of 121222105 is about 494.9111904068.

Adding to 121222105 its sum of digits (16), we get a palindrome (121222121).

Adding to 121222105 its reverse (501222121), we get a palindrome (622444226).

The spelling of 121222105 in words is "one hundred twenty-one million, two hundred twenty-two thousand, one hundred five".