20322320521 has 2 divisors, whose sum is σ = 20322320522. Its totient is φ = 20322320520.

The previous prime is 20322320471. The next prime is 20322320527. The reversal of 20322320521 is 12502322302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10781914896 + 9540405625 = 103836^2 + 97675^2 .

It is a cyclic number.

It is not a de Polignac number, because 20322320521 - 2¹⁵ = 20322287753 is a prime.

It is a super-2 number, since 2×20322320521² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20322320492 and 20322320501.

It is not a weakly prime, because it can be changed into another prime (20322320527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161160260 + 10161160261.

It is an arithmetic number, because the mean of its divisors is an integer number (10161160261).

Almost surely, 2^20322320521 is an apocalyptic number.

It is an amenable number.

20322320521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20322320521 is an equidigital number, since it uses as much as digits as its factorization.

20322320521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 22.

Adding to 20322320521 its reverse (12502322302), we get a palindrome (32824642823).

The spelling of 20322320521 in words is "twenty billion, three hundred twenty-two million, three hundred twenty thousand, five hundred twenty-one".