211775213 has 4 divisors (see below), whose sum is σ = 228065628. Its totient is φ = 195484800.

The previous prime is 211775189. The next prime is 211775231. The reversal of 211775213 is 312577112.

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 61418569 + 150356644 = 7837^2 + 12262^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211775213 is a prime.

It is a super-3 number, since 3×211775213³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211775243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8145188 + ... + 8145213.

It is an arithmetic number, because the mean of its divisors is an integer number (57016407).

Almost surely, 2^211775213 is an apocalyptic number.

It is an amenable number.

211775213 is a deficient number, since it is larger than the sum of its proper divisors (16290415).

211775213 is a wasteful number, since it uses less digits than its factorization.

211775213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16290414.

The product of its digits is 2940, while the sum is 29.

The square root of 211775213 is about 14552.4985140010. The cubic root of 211775213 is about 596.0623752339.

The spelling of 211775213 in words is "two hundred eleven million, seven hundred seventy-five thousand, two hundred thirteen".