211009999 has 2 divisors, whose sum is σ = 211010000. Its totient is φ = 211009998.

The previous prime is 211009973. The next prime is 211010047. The reversal of 211009999 is 999900112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211009999 - 2⁷ = 211009871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211009969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105504999 + 105505000.

It is an arithmetic number, because the mean of its divisors is an integer number (105505000).

Almost surely, 2^211009999 is an apocalyptic number.

211009999 is a deficient number, since it is larger than the sum of its proper divisors (1).

211009999 is an equidigital number, since it uses as much as digits as its factorization.

211009999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 211009999 is about 14526.1832220305. The cubic root of 211009999 is about 595.3435851882.

The spelling of 211009999 in words is "two hundred eleven million, nine thousand, nine hundred ninety-nine".