21203201417 has 4 divisors (see below), whose sum is σ = 21207963156. Its totient is φ = 21198439680.

The previous prime is 21203201399. The next prime is 21203201441. The reversal of 21203201417 is 71410230212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6575750281 + 14627451136 = 81091^2 + 120944^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203201417 - 2¹⁰ = 21203200393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203201392 and 21203201401.

It is not an unprimeable number, because it can be changed into a prime (21203201447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2374184 + ... + 2383097.

It is an arithmetic number, because the mean of its divisors is an integer number (5301990789).

Almost surely, 2^21203201417 is an apocalyptic number.

It is an amenable number.

21203201417 is a deficient number, since it is larger than the sum of its proper divisors (4761739).

21203201417 is an equidigital number, since it uses as much as digits as its factorization.

21203201417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4761738.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 21203201417 its reverse (71410230212), we get a palindrome (92613431629).

The spelling of 21203201417 in words is "twenty-one billion, two hundred three million, two hundred one thousand, four hundred seventeen".