21260143417 has 2 divisors, whose sum is σ = 21260143418. Its totient is φ = 21260143416.

The previous prime is 21260143343. The next prime is 21260143447. The reversal of 21260143417 is 71434106212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19199982096 + 2060161321 = 138564^2 + 45389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21260143417 is a prime.

It is a super-2 number, since 2×21260143417² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21260143447) 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, 10630071708 + 10630071709.

It is an arithmetic number, because the mean of its divisors is an integer number (10630071709).

Almost surely, 2^21260143417 is an apocalyptic number.

It is an amenable number.

21260143417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21260143417 is an equidigital number, since it uses as much as digits as its factorization.

21260143417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 21260143417 its reverse (71434106212), we get a palindrome (92694249629).

The spelling of 21260143417 in words is "twenty-one billion, two hundred sixty million, one hundred forty-three thousand, four hundred seventeen".