211538 has 4 divisors (see below), whose sum is σ = 317310. Its totient is φ = 105768.

The previous prime is 211507. The next prime is 211543. The reversal of 211538 is 835112.

211538 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

211538 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.

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

It can be written as a sum of positive squares in only one way, i.e., 113569 + 97969 = 337^2 + 313^2 .

It is an unprimeable number.

211538 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52883 + ... + 52886.

2²¹¹⁵³⁸ is an apocalyptic number.

211538 is a deficient number, since it is larger than the sum of its proper divisors (105772).

211538 is a wasteful number, since it uses less digits than its factorization.

211538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105771.

The product of its digits is 240, while the sum is 20.

The square root of 211538 is about 459.9326037584. The cubic root of 211538 is about 59.5839738902.

The spelling of 211538 in words is "two hundred eleven thousand, five hundred thirty-eight".