214721209 has 2 divisors, whose sum is σ = 214721210. Its totient is φ = 214721208.

The previous prime is 214721189. The next prime is 214721233. The reversal of 214721209 is 902127412.

214721209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200845584 + 13875625 = 14172^2 + 3725^2 .

It is a cyclic number.

It is not a de Polignac number, because 214721209 - 2⁷ = 214721081 is a prime.

It is a super-2 number, since 2×214721209² = 92210395188843362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (214721279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107360604 + 107360605.

It is an arithmetic number, because the mean of its divisors is an integer number (107360605).

Almost surely, 2^214721209 is an apocalyptic number.

It is an amenable number.

214721209 is a deficient number, since it is larger than the sum of its proper divisors (1).

214721209 is an equidigital number, since it uses as much as digits as its factorization.

214721209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 214721209 is about 14653.3685205826. The cubic root of 214721209 is about 598.8135898571.

The spelling of 214721209 in words is "two hundred fourteen million, seven hundred twenty-one thousand, two hundred nine".