211493857 has 4 divisors (see below), whose sum is σ = 212425776. Its totient is φ = 210561940.

The previous prime is 211493837. The next prime is 211493861. The reversal of 211493857 is 758394112.

211493857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211493857 - 2¹⁹ = 210969569 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211493827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465619 + ... + 466072.

It is an arithmetic number, because the mean of its divisors is an integer number (53106444).

Almost surely, 2^211493857 is an apocalyptic number.

It is an amenable number.

211493857 is a deficient number, since it is larger than the sum of its proper divisors (931919).

211493857 is an equidigital number, since it uses as much as digits as its factorization.

211493857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931918.

The product of its digits is 60480, while the sum is 40.

The square root of 211493857 is about 14542.8283700249. The cubic root of 211493857 is about 595.7982901109.

The spelling of 211493857 in words is "two hundred eleven million, four hundred ninety-three thousand, eight hundred fifty-seven".