20443320310421 has 2 divisors, whose sum is σ = 20443320310422. Its totient is φ = 20443320310420.

The previous prime is 20443320310417. The next prime is 20443320310447. The reversal of 20443320310421 is 12401302334402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15770866275025 + 4672454035396 = 3971255^2 + 2161586^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443320310421 - 2² = 20443320310417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20443320310411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221660155210 + 10221660155211.

It is an arithmetic number, because the mean of its divisors is an integer number (10221660155211).

Almost surely, 2^{20443320310421} is an apocalyptic number.

It is an amenable number.

20443320310421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443320310421 is an equidigital number, since it uses as much as digits as its factorization.

20443320310421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 20443320310421 its reverse (12401302334402), we get a palindrome (32844622644823).

The spelling of 20443320310421 in words is "twenty trillion, four hundred forty-three billion, three hundred twenty million, three hundred ten thousand, four hundred twenty-one".