1222121716 has 12 divisors (see below), whose sum is σ = 2143655332. Its totient is φ = 609648768.

The previous prime is 1222121699. The next prime is 1222121723. The reversal of 1222121716 is 6171212221.

It can be written as a sum of positive squares in 2 ways, for example, as 566249616 + 655872100 = 23796^2 + 25610^2 .

It is a congruent number.

It is an unprimeable number.

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, 351075 + ... + 354538.

Almost surely, 2^1222121716 is an apocalyptic number.

It is an amenable number.

1222121716 is a deficient number, since it is larger than the sum of its proper divisors (921533616).

1222121716 is a wasteful number, since it uses less digits than its factorization.

1222121716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706050 (or 706048 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 1222121716 is about 34958.8574756098. The cubic root of 1222121716 is about 1069.1488021809.

Adding to 1222121716 its reverse (6171212221), we get a palindrome (7393333937).

The spelling of 1222121716 in words is "one billion, two hundred twenty-two million, one hundred twenty-one thousand, seven hundred sixteen".