1321012021213 has 2 divisors, whose sum is σ = 1321012021214. Its totient is φ = 1321012021212.

The previous prime is 1321012021193. The next prime is 1321012021247. The reversal of 1321012021213 is 3121202101231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 765059854329 + 555952166884 = 874677^2 + 745622^2 .

It is an emirp because it is prime and its reverse (3121202101231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321012021213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321012121213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660506010606 + 660506010607.

It is an arithmetic number, because the mean of its divisors is an integer number (660506010607).

Almost surely, 2^{1321012021213} is an apocalyptic number.

It is an amenable number.

1321012021213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321012021213 is an equidigital number, since it uses as much as digits as its factorization.

1321012021213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1321012021213 its reverse (3121202101231), we get a palindrome (4442214122444).

The spelling of 1321012021213 in words is "one trillion, three hundred twenty-one billion, twelve million, twenty-one thousand, two hundred thirteen".