216727427 has 4 divisors (see below), whose sum is σ = 247688496. Its totient is φ = 185766360.

The previous prime is 216727421. The next prime is 216727447. The reversal of 216727427 is 724727612.

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

It is a cyclic number.

It is not a de Polignac number, because 216727427 - 2¹⁰ = 216726403 is a prime.

It is a super-2 number, since 2×216727427² = 93941555228080658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216727421) 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, 15480524 + ... + 15480537.

It is an arithmetic number, because the mean of its divisors is an integer number (61922124).

Almost surely, 2^216727427 is an apocalyptic number.

216727427 is a deficient number, since it is larger than the sum of its proper divisors (30961069).

216727427 is an equidigital number, since it uses as much as digits as its factorization.

216727427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30961068.

The product of its digits is 65856, while the sum is 38.

The square root of 216727427 is about 14721.6652251028. The cubic root of 216727427 is about 600.6727888285.

The spelling of 216727427 in words is "two hundred sixteen million, seven hundred twenty-seven thousand, four hundred twenty-seven".