21020244143473 has 2 divisors, whose sum is σ = 21020244143474. Its totient is φ = 21020244143472.

The previous prime is 21020244143441. The next prime is 21020244143611. The reversal of 21020244143473 is 37434144202012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14516275260529 + 6503968882944 = 3810023^2 + 2550288^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020244143473 - 2⁵ = 21020244143441 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020244140473) 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, 10510122071736 + 10510122071737.

It is an arithmetic number, because the mean of its divisors is an integer number (10510122071737).

Almost surely, 2^{21020244143473} is an apocalyptic number.

It is an amenable number.

21020244143473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020244143473 is an equidigital number, since it uses as much as digits as its factorization.

21020244143473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 37.

Adding to 21020244143473 its reverse (37434144202012), we get a palindrome (58454388345485).

The spelling of 21020244143473 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty-three thousand, four hundred seventy-three".