21020244140473 has 2 divisors, whose sum is σ = 21020244140474. Its totient is φ = 21020244140472.

The previous prime is 21020244140461. The next prime is 21020244140507. The reversal of 21020244140473 is 37404144202012.

It is an a-pointer prime, because the next prime (21020244140507) can be obtained adding 21020244140473 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16423542444409 + 4596701696064 = 4052597^2 + 2143992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020244140473 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020244143473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510122070236 + 10510122070237.

It is an arithmetic number, because the mean of its divisors is an integer number (10510122070237).

Almost surely, 2^{21020244140473} is an apocalyptic number.

It is an amenable number.

21020244140473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020244140473 is an equidigital number, since it uses as much as digits as its factorization.

21020244140473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 34.

Adding to 21020244140473 its reverse (37404144202012), we get a palindrome (58424388342485).

The spelling of 21020244140473 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty thousand, four hundred seventy-three".