214821209 has 2 divisors, whose sum is σ = 214821210. Its totient is φ = 214821208.

The previous prime is 214821203. The next prime is 214821251. The reversal of 214821209 is 902128412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133911184 + 80910025 = 11572^2 + 8995^2 .

It is a cyclic number.

It is not a de Polignac number, because 214821209 - 2²⁰ = 213772633 is a prime.

It is a super-2 number, since 2×214821209² = 92296303672443362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (214821203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107410604 + 107410605.

It is an arithmetic number, because the mean of its divisors is an integer number (107410605).

Almost surely, 2^214821209 is an apocalyptic number.

It is an amenable number.

214821209 is a deficient number, since it is larger than the sum of its proper divisors (1).

214821209 is an equidigital number, since it uses as much as digits as its factorization.

214821209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 214821209 is about 14656.7803081031. The cubic root of 214821209 is about 598.9065352873.

The spelling of 214821209 in words is "two hundred fourteen million, eight hundred twenty-one thousand, two hundred nine".