216441427 has 2 divisors, whose sum is σ = 216441428. Its totient is φ = 216441426.

The previous prime is 216441367. The next prime is 216441451. The reversal of 216441427 is 724144612.

216441427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216441427 is a prime.

It is not a weakly prime, because it can be changed into another prime (216441457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108220713 + 108220714.

It is an arithmetic number, because the mean of its divisors is an integer number (108220714).

Almost surely, 2^216441427 is an apocalyptic number.

216441427 is a deficient number, since it is larger than the sum of its proper divisors (1).

216441427 is an equidigital number, since it uses as much as digits as its factorization.

216441427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

The square root of 216441427 is about 14711.9484433572. The cubic root of 216441427 is about 600.4084505875.

The spelling of 216441427 in words is "two hundred sixteen million, four hundred forty-one thousand, four hundred twenty-seven".