21301035473 has 2 divisors, whose sum is σ = 21301035474. Its totient is φ = 21301035472.

The previous prime is 21301035467. The next prime is 21301035551. The reversal of 21301035473 is 37453010312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18281203264 + 3019832209 = 135208^2 + 54953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21301035473 is a prime.

It is a super-2 number, since 2×21301035473² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21301035443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650517736 + 10650517737.

It is an arithmetic number, because the mean of its divisors is an integer number (10650517737).

Almost surely, 2^21301035473 is an apocalyptic number.

It is an amenable number.

21301035473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301035473 is an equidigital number, since it uses as much as digits as its factorization.

21301035473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 29.

Adding to 21301035473 its reverse (37453010312), we get a palindrome (58754045785).

The spelling of 21301035473 in words is "twenty-one billion, three hundred one million, thirty-five thousand, four hundred seventy-three".