211973 has 8 divisors (see below), whose sum is σ = 231192. Its totient is φ = 193536.

The previous prime is 211969. The next prime is 211979. The reversal of 211973 is 379112.

It can be written as a sum of positive squares in 4 ways, for example, as 77284 + 134689 = 278^2 + 367^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211973 - 2² = 211969 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461 + ... + 797.

It is an arithmetic number, because the mean of its divisors is an integer number (28899).

2²¹¹⁹⁷³ is an apocalyptic number.

It is an amenable number.

211973 is a deficient number, since it is larger than the sum of its proper divisors (19219).

211973 is a wasteful number, since it uses less digits than its factorization.

211973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391.

The product of its digits is 378, while the sum is 23.

The square root of 211973 is about 460.4052562689. The cubic root of 211973 is about 59.6247881215.

The spelling of 211973 in words is "two hundred eleven thousand, nine hundred seventy-three".