21141544717 has 2 divisors, whose sum is σ = 21141544718. Its totient is φ = 21141544716.

The previous prime is 21141544667. The next prime is 21141544751. The reversal of 21141544717 is 71744514112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15189576516 + 5951968201 = 123246^2 + 77149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21141544717 is a prime.

It is a super-2 number, since 2×21141544717² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21141544757) 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, 10570772358 + 10570772359.

It is an arithmetic number, because the mean of its divisors is an integer number (10570772359).

Almost surely, 2^21141544717 is an apocalyptic number.

It is an amenable number.

21141544717 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141544717 is an equidigital number, since it uses as much as digits as its factorization.

21141544717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31360, while the sum is 37.

The spelling of 21141544717 in words is "twenty-one billion, one hundred forty-one million, five hundred forty-four thousand, seven hundred seventeen".