1321202020013 has 4 divisors (see below), whose sum is σ = 1336046986620. Its totient is φ = 1306357053408.

The previous prime is 1321202020003. The next prime is 1321202020027. The reversal of 1321202020013 is 3100202021231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 827157508324 + 494044511689 = 909482^2 + 702883^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321202020013 - 2⁸ = 1321202019757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321202019973 and 1321202020000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321202020003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7422483170 + ... + 7422483347.

It is an arithmetic number, because the mean of its divisors is an integer number (334011746655).

Almost surely, 2^{1321202020013} is an apocalyptic number.

It is an amenable number.

1321202020013 is a deficient number, since it is larger than the sum of its proper divisors (14844966607).

1321202020013 is an equidigital number, since it uses as much as digits as its factorization.

1321202020013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14844966606.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1321202020013 its reverse (3100202021231), we get a palindrome (4421404041244).

The spelling of 1321202020013 in words is "one trillion, three hundred twenty-one billion, two hundred two million, twenty thousand, thirteen".