21534113417 has 2 divisors, whose sum is σ = 21534113418. Its totient is φ = 21534113416.

The previous prime is 21534113411. The next prime is 21534113437. The reversal of 21534113417 is 71431143512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20610622096 + 923491321 = 143564^2 + 30389^2 .

It is a cyclic number.

It is not a de Polignac number, because 21534113417 - 2²⁶ = 21467004553 is a prime.

It is not a weakly prime, because it can be changed into another prime (21534113411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10767056708 + 10767056709.

It is an arithmetic number, because the mean of its divisors is an integer number (10767056709).

Almost surely, 2^21534113417 is an apocalyptic number.

It is an amenable number.

21534113417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21534113417 is an equidigital number, since it uses as much as digits as its factorization.

21534113417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

Adding to 21534113417 its reverse (71431143512), we get a palindrome (92965256929).

The spelling of 21534113417 in words is "twenty-one billion, five hundred thirty-four million, one hundred thirteen thousand, four hundred seventeen".