1221322113 has 12 divisors (see below), whose sum is σ = 1924507728. Its totient is φ = 740195160.

The previous prime is 1221322111. The next prime is 1221322117. The reversal of 1221322113 is 3112231221.

It is not a de Polignac number, because 1221322113 - 2¹ = 1221322111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221322111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6168195 + ... + 6168392.

It is an arithmetic number, because the mean of its divisors is an integer number (160375644).

Almost surely, 2^1221322113 is an apocalyptic number.

It is an amenable number.

1221322113 is a deficient number, since it is larger than the sum of its proper divisors (703185615).

1221322113 is a wasteful number, since it uses less digits than its factorization.

1221322113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12336604 (or 12336601 counting only the distinct ones).

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

The square root of 1221322113 is about 34947.4192609411. The cubic root of 1221322113 is about 1068.9155790653.

Adding to 1221322113 its reverse (3112231221), we get a palindrome (4333553334).

The spelling of 1221322113 in words is "one billion, two hundred twenty-one million, three hundred twenty-two thousand, one hundred thirteen".