21116525473 has 2 divisors, whose sum is σ = 21116525474. Its totient is φ = 21116525472.

The previous prime is 21116525467. The next prime is 21116525509. The reversal of 21116525473 is 37452561112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14832316944 + 6284208529 = 121788^2 + 79273^2 .

It is a cyclic number.

It is not a de Polignac number, because 21116525473 - 2²⁹ = 20579654561 is a prime.

It is not a weakly prime, because it can be changed into another prime (21116525413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558262736 + 10558262737.

It is an arithmetic number, because the mean of its divisors is an integer number (10558262737).

Almost surely, 2^21116525473 is an apocalyptic number.

It is an amenable number.

21116525473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116525473 is an equidigital number, since it uses as much as digits as its factorization.

21116525473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The spelling of 21116525473 in words is "twenty-one billion, one hundred sixteen million, five hundred twenty-five thousand, four hundred seventy-three".