27317122421 has 4 divisors (see below), whose sum is σ = 27317491692. Its totient is φ = 27316753152.

The previous prime is 27317122409. The next prime is 27317122447. The reversal of 27317122421 is 12422171372.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24845640625 + 2471481796 = 157625^2 + 49714^2 .

It is a cyclic number.

It is not a de Polignac number, because 27317122421 - 2¹⁰ = 27317121397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27317122451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31130 + ... + 235803.

It is an arithmetic number, because the mean of its divisors is an integer number (6829372923).

Almost surely, 2^27317122421 is an apocalyptic number.

It is an amenable number.

27317122421 is a deficient number, since it is larger than the sum of its proper divisors (369271).

27317122421 is a wasteful number, since it uses less digits than its factorization.

27317122421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369270.

The product of its digits is 9408, while the sum is 32.

Adding to 27317122421 its reverse (12422171372), we get a palindrome (39739293793).

It can be divided in two parts, 273171 and 22421, that added together give a palindrome (295592).

The spelling of 27317122421 in words is "twenty-seven billion, three hundred seventeen million, one hundred twenty-two thousand, four hundred twenty-one".