21455107417 has 2 divisors, whose sum is σ = 21455107418. Its totient is φ = 21455107416.

The previous prime is 21455107403. The next prime is 21455107463. The reversal of 21455107417 is 71470155412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13364284816 + 8090822601 = 115604^2 + 89949^2 .

It is a cyclic number.

It is not a de Polignac number, because 21455107417 - 2¹⁵ = 21455074649 is a prime.

It is not a weakly prime, because it can be changed into another prime (21455167417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727553708 + 10727553709.

It is an arithmetic number, because the mean of its divisors is an integer number (10727553709).

Almost surely, 2^21455107417 is an apocalyptic number.

It is an amenable number.

21455107417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21455107417 is an equidigital number, since it uses as much as digits as its factorization.

21455107417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39200, while the sum is 37.

The spelling of 21455107417 in words is "twenty-one billion, four hundred fifty-five million, one hundred seven thousand, four hundred seventeen".