211000102009 has 2 divisors, whose sum is σ = 211000102010. Its totient is φ = 211000102008.

The previous prime is 211000102003. The next prime is 211000102043. The reversal of 211000102009 is 900201000112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210999666409 + 435600 = 459347^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 211000102009 - 2¹³ = 211000093817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211000101983 and 211000102001.

It is not a weakly prime, because it can be changed into another prime (211000102003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105500051004 + 105500051005.

It is an arithmetic number, because the mean of its divisors is an integer number (105500051005).

Almost surely, 2^211000102009 is an apocalyptic number.

It is an amenable number.

211000102009 is a deficient number, since it is larger than the sum of its proper divisors (1).

211000102009 is an equidigital number, since it uses as much as digits as its factorization.

211000102009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 211000102009 in words is "two hundred eleven billion, one hundred two thousand, nine".