214821779 has 2 divisors, whose sum is σ = 214821780. Its totient is φ = 214821778.

The previous prime is 214821767. The next prime is 214821781. The reversal of 214821779 is 977128412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-214821779 is a prime.

It is a super-3 number, since 3×214821779³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

Together with 214821781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (214821709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107410889 + 107410890.

It is an arithmetic number, because the mean of its divisors is an integer number (107410890).

Almost surely, 2^214821779 is an apocalyptic number.

214821779 is a deficient number, since it is larger than the sum of its proper divisors (1).

214821779 is an equidigital number, since it uses as much as digits as its factorization.

214821779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 41.

The square root of 214821779 is about 14656.7997530157. The cubic root of 214821779 is about 598.9070649936.

The spelling of 214821779 in words is "two hundred fourteen million, eight hundred twenty-one thousand, seven hundred seventy-nine".