21014032517 has 2 divisors, whose sum is σ = 21014032518. Its totient is φ = 21014032516.

The previous prime is 21014032511. The next prime is 21014032541. The reversal of 21014032517 is 71523041012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19439609476 + 1574423041 = 139426^2 + 39679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21014032517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21014032511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507016258 + 10507016259.

It is an arithmetic number, because the mean of its divisors is an integer number (10507016259).

Almost surely, 2^21014032517 is an apocalyptic number.

It is an amenable number.

21014032517 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014032517 is an equidigital number, since it uses as much as digits as its factorization.

21014032517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 21014032517 its reverse (71523041012), we get a palindrome (92537073529).

The spelling of 21014032517 in words is "twenty-one billion, fourteen million, thirty-two thousand, five hundred seventeen".