13021310020021 has 4 divisors (see below), whose sum is σ = 13096577708172. Its totient is φ = 12946042331872.

The previous prime is 13021310019959. The next prime is 13021310020073. The reversal of 13021310020021 is 12002001312031.

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 5450497236900 + 7570812783121 = 2334630^2 + 2751511^2 .

It is a cyclic number.

It is not a de Polignac number, because 13021310020021 - 2¹¹ = 13021310017973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13021310019977 and 13021310020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13021310020421) 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, 37633843816 + ... + 37633844161.

It is an arithmetic number, because the mean of its divisors is an integer number (3274144427043).

Almost surely, 2^{13021310020021} is an apocalyptic number.

It is an amenable number.

13021310020021 is a deficient number, since it is larger than the sum of its proper divisors (75267688151).

13021310020021 is an equidigital number, since it uses as much as digits as its factorization.

13021310020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75267688150.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 13021310020021 its reverse (12002001312031), we get a palindrome (25023311332052).

The spelling of 13021310020021 in words is "thirteen trillion, twenty-one billion, three hundred ten million, twenty thousand, twenty-one".