211723 has 2 divisors, whose sum is σ = 211724. Its totient is φ = 211722.

The previous prime is 211711. The next prime is 211727. The reversal of 211723 is 327112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211723 - 2⁵ = 211691 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 211697 and 211706.

It is not a weakly prime, because it can be changed into another prime (211727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105861 + 105862.

It is an arithmetic number, because the mean of its divisors is an integer number (105862).

2²¹¹⁷²³ is an apocalyptic number.

211723 is a deficient number, since it is larger than the sum of its proper divisors (1).

211723 is an equidigital number, since it uses as much as digits as its factorization.

211723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84, while the sum is 16.

The square root of 211723 is about 460.1336762290. The cubic root of 211723 is about 59.6013384982.

Adding to 211723 its reverse (327112), we get a palindrome (538835).

The spelling of 211723 in words is "two hundred eleven thousand, seven hundred twenty-three", and thus it is an iban number.