21761130473 has 2 divisors, whose sum is σ = 21761130474. Its totient is φ = 21761130472.

The previous prime is 21761130467. The next prime is 21761130487. The reversal of 21761130473 is 37403116712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14513502784 + 7247627689 = 120472^2 + 85133^2 .

It is a cyclic number.

It is not a de Polignac number, because 21761130473 - 2²⁰ = 21760081897 is a prime.

It is not a weakly prime, because it can be changed into another prime (21761130493) 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, 10880565236 + 10880565237.

It is an arithmetic number, because the mean of its divisors is an integer number (10880565237).

Almost surely, 2^21761130473 is an apocalyptic number.

It is an amenable number.

21761130473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21761130473 is an equidigital number, since it uses as much as digits as its factorization.

21761130473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The spelling of 21761130473 in words is "twenty-one billion, seven hundred sixty-one million, one hundred thirty thousand, four hundred seventy-three".