27717421 has 4 divisors (see below), whose sum is σ = 27730144. Its totient is φ = 27704700.

The previous prime is 27717419. The next prime is 27717449. The reversal of 27717421 is 12471772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 27717421 - 2¹ = 27717419 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 (27717401) 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, 2175 + ... + 7756.

It is an arithmetic number, because the mean of its divisors is an integer number (6932536).

Almost surely, 2^27717421 is an apocalyptic number.

It is an amenable number.

27717421 is a deficient number, since it is larger than the sum of its proper divisors (12723).

27717421 is an equidigital number, since it uses as much as digits as its factorization.

27717421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12722.

The product of its digits is 5488, while the sum is 31.

The square root of 27717421 is about 5264.7337064661. The cubic root of 27717421 is about 302.6339219871.

The spelling of 27717421 in words is "twenty-seven million, seven hundred seventeen thousand, four hundred twenty-one".