1321022221213 has 6 divisors (see below), whose sum is σ = 1394209048254. Its totient is φ = 1251494735544.

The previous prime is 1321022221133. The next prime is 1321022221217. The reversal of 1321022221213 is 3121222201231.

It can be written as a sum of positive squares in only one way, i.e., 1318643415684 + 2378805529 = 1148322^2 + 48773^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1321022221213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321022221217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1829670306 + ... + 1829671027.

It is an arithmetic number, because the mean of its divisors is an integer number (232368174709).

Almost surely, 2^{1321022221213} is an apocalyptic number.

It is an amenable number.

1321022221213 is a deficient number, since it is larger than the sum of its proper divisors (73186827041).

1321022221213 is an equidigital number, since it uses as much as digits as its factorization.

1321022221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3659341371 (or 3659341352 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1321022221213 its reverse (3121222201231), we get a palindrome (4442244422444).

The spelling of 1321022221213 in words is "one trillion, three hundred twenty-one billion, twenty-two million, two hundred twenty-one thousand, two hundred thirteen".