20321110393 has 2 divisors, whose sum is σ = 20321110394. Its totient is φ = 20321110392.

The previous prime is 20321110379. The next prime is 20321110427. The reversal of 20321110393 is 39301112302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14105837824 + 6215272569 = 118768^2 + 78837^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321110393 - 2¹⁷ = 20320979321 is a prime.

It is a super-2 number, since 2×20321110393² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20321110193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160555196 + 10160555197.

It is an arithmetic number, because the mean of its divisors is an integer number (10160555197).

Almost surely, 2^20321110393 is an apocalyptic number.

It is an amenable number.

20321110393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321110393 is an equidigital number, since it uses as much as digits as its factorization.

20321110393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 20321110393 its reverse (39301112302), we get a palindrome (59622222695).

The spelling of 20321110393 in words is "twenty billion, three hundred twenty-one million, one hundred ten thousand, three hundred ninety-three".