205211011 has 2 divisors, whose sum is σ = 205211012. Its totient is φ = 205211010.

The previous prime is 205211009. The next prime is 205211021. The reversal of 205211011 is 110112502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205211011 - 2¹ = 205211009 is a prime.

It is a super-2 number, since 2×205211011² = 84223118071284242, which contains 22 as substring.

Together with 205211009, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 205210982 and 205211000.

It is not a weakly prime, because it can be changed into another prime (205211021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102605505 + 102605506.

It is an arithmetic number, because the mean of its divisors is an integer number (102605506).

Almost surely, 2^205211011 is an apocalyptic number.

205211011 is a deficient number, since it is larger than the sum of its proper divisors (1).

205211011 is an equidigital number, since it uses as much as digits as its factorization.

205211011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 205211011 is about 14325.1879917857. The cubic root of 205211011 is about 589.8390933421.

Adding to 205211011 its reverse (110112502), we get a palindrome (315323513).

The spelling of 205211011 in words is "two hundred five million, two hundred eleven thousand, eleven".