20230321681 has 2 divisors, whose sum is σ = 20230321682. Its totient is φ = 20230321680.

The previous prime is 20230321667. The next prime is 20230321693. The reversal of 20230321681 is 18612303202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17052181056 + 3178140625 = 130584^2 + 56375^2 .

It is a cyclic number.

It is not a de Polignac number, because 20230321681 - 2²⁹ = 19693450769 is a prime.

It is a super-2 number, since 2×20230321681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20230321781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10115160840 + 10115160841.

It is an arithmetic number, because the mean of its divisors is an integer number (10115160841).

Almost surely, 2^20230321681 is an apocalyptic number.

It is an amenable number.

20230321681 is a deficient number, since it is larger than the sum of its proper divisors (1).

20230321681 is an equidigital number, since it uses as much as digits as its factorization.

20230321681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 20230321681 its reverse (18612303202), we get a palindrome (38842624883).

The spelling of 20230321681 in words is "twenty billion, two hundred thirty million, three hundred twenty-one thousand, six hundred eighty-one".