20321942321 has 2 divisors, whose sum is σ = 20321942322. Its totient is φ = 20321942320.

The previous prime is 20321942243. The next prime is 20321942351. The reversal of 20321942321 is 12324912302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20311950400 + 9991921 = 142520^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321942321 - 2¹⁸ = 20321680177 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321942351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160971160 + 10160971161.

It is an arithmetic number, because the mean of its divisors is an integer number (10160971161).

Almost surely, 2^20321942321 is an apocalyptic number.

It is an amenable number.

20321942321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321942321 is an equidigital number, since it uses as much as digits as its factorization.

20321942321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 20321942321 in words is "twenty billion, three hundred twenty-one million, nine hundred forty-two thousand, three hundred twenty-one".