211913 has 4 divisors (see below), whose sum is σ = 228228. Its totient is φ = 195600.

The previous prime is 211891. The next prime is 211927. The reversal of 211913 is 319112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104329 + 107584 = 323^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 211913 - 2⁸ = 211657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211891 and 211900.

It is not an unprimeable number, because it can be changed into a prime (211933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8138 + ... + 8163.

It is an arithmetic number, because the mean of its divisors is an integer number (57057).

2²¹¹⁹¹³ is an apocalyptic number.

It is an amenable number.

211913 is a deficient number, since it is larger than the sum of its proper divisors (16315).

211913 is a wasteful number, since it uses less digits than its factorization.

211913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16314.

The product of its digits is 54, while the sum is 17.

The square root of 211913 is about 460.3400916714. The cubic root of 211913 is about 59.6191618941.

The spelling of 211913 in words is "two hundred eleven thousand, nine hundred thirteen".