20329421721841 has 2 divisors, whose sum is σ = 20329421721842. Its totient is φ = 20329421721840.

The previous prime is 20329421721823. The next prime is 20329421721899. The reversal of 20329421721841 is 14812712492302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18915888577600 + 1413533144241 = 4349240^2 + 1188921^2 .

It is a cyclic number.

It is not a de Polignac number, because 20329421721841 - 2¹⁷ = 20329421590769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20329421721791 and 20329421721800.

It is not a weakly prime, because it can be changed into another prime (20329421721811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10164710860920 + 10164710860921.

It is an arithmetic number, because the mean of its divisors is an integer number (10164710860921).

Almost surely, 2^{20329421721841} is an apocalyptic number.

It is an amenable number.

20329421721841 is a deficient number, since it is larger than the sum of its proper divisors (1).

20329421721841 is an equidigital number, since it uses as much as digits as its factorization.

20329421721841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 20329421721841 in words is "twenty trillion, three hundred twenty-nine billion, four hundred twenty-one million, seven hundred twenty-one thousand, eight hundred forty-one".