20570243002321 has 4 divisors (see below), whose sum is σ = 20570252475492. Its totient is φ = 20570233529152.

The previous prime is 20570243002313. The next prime is 20570243002343. The reversal of 20570243002321 is 12320034207502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4771009221696 + 15799233780625 = 2184264^2 + 3974825^2 .

It is a cyclic number.

It is not a de Polignac number, because 20570243002321 - 2³ = 20570243002313 is a prime.

It is a super-2 number, since 2×20570243002321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20570243005321) 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 3 ways as a sum of consecutive naturals, for example, 319821 + ... + 6422053.

It is an arithmetic number, because the mean of its divisors is an integer number (5142563118873).

Almost surely, 2^{20570243002321} is an apocalyptic number.

It is an amenable number.

20570243002321 is a deficient number, since it is larger than the sum of its proper divisors (9473171).

20570243002321 is an equidigital number, since it uses as much as digits as its factorization.

20570243002321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473170.

The product of its (nonzero) digits is 20160, while the sum is 31.

Adding to 20570243002321 its reverse (12320034207502), we get a palindrome (32890277209823).

The spelling of 20570243002321 in words is "twenty trillion, five hundred seventy billion, two hundred forty-three million, two thousand, three hundred twenty-one".