1211221096 has 16 divisors (see below), whose sum is σ = 2275245540. Its totient is φ = 604488960.

The previous prime is 1211221093. The next prime is 1211221097. The reversal of 1211221096 is 6901221121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1081488996 + 129732100 = 32886^2 + 11390^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1211221096.

It is not an unprimeable number, because it can be changed into a prime (1211221091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135601 + ... + 144256.

Almost surely, 2^1211221096 is an apocalyptic number.

It is an amenable number.

1211221096 is a deficient number, since it is larger than the sum of its proper divisors (1064024444).

1211221096 is a wasteful number, since it uses less digits than its factorization.

1211221096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280404 (or 280400 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1211221096 is about 34802.6018567578. The cubic root of 1211221096 is about 1065.9605742769.

Adding to 1211221096 its sum of digits (25), we get a palindrome (1211221121).

The spelling of 1211221096 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, ninety-six".