1321220223013 has 2 divisors, whose sum is σ = 1321220223014. Its totient is φ = 1321220223012.

The previous prime is 1321220222939. The next prime is 1321220223023. The reversal of 1321220223013 is 3103220221231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1271215660324 + 50004562689 = 1127482^2 + 223617^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321220223013 - 2⁹ = 1321220222501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321220223023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660610111506 + 660610111507.

It is an arithmetic number, because the mean of its divisors is an integer number (660610111507).

Almost surely, 2^{1321220223013} is an apocalyptic number.

It is an amenable number.

1321220223013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321220223013 is an equidigital number, since it uses as much as digits as its factorization.

1321220223013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1321220223013 its reverse (3103220221231), we get a palindrome (4424440444244).

The spelling of 1321220223013 in words is "one trillion, three hundred twenty-one billion, two hundred twenty million, two hundred twenty-three thousand, thirteen".