1221311322 has 72 divisors (see below), whose sum is σ = 3324161568. Its totient is φ = 317219760.

The previous prime is 1221311261. The next prime is 1221311341. The reversal of 1221311322 is 2231131221.

1221311322 is a `hidden beast` number, since 12 + 21 + 311 + 322 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1221311295 and 1221311304.

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 35 ways as a sum of consecutive naturals, for example, 24808 + ... + 55299.

Almost surely, 2^1221311322 is an apocalyptic number.

1221311322 is an abundant number, since it is smaller than the sum of its proper divisors (2102850246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221311322 is a wasteful number, since it uses less digits than its factorization.

1221311322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80144 (or 80130 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1221311322 is about 34947.2648715175. The cubic root of 1221311322 is about 1068.9124309190.

Adding to 1221311322 its reverse (2231131221), we get a palindrome (3452442543).

The spelling of 1221311322 in words is "one billion, two hundred twenty-one million, three hundred eleven thousand, three hundred twenty-two".