211857055 has 4 divisors (see below), whose sum is σ = 254228472. Its totient is φ = 169485640.

The previous prime is 211857053. The next prime is 211857101. The reversal of 211857055 is 550758112.

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

It is not a de Polignac number, because 211857055 - 2¹ = 211857053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211857055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211857053) 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, 21185701 + ... + 21185710.

It is an arithmetic number, because the mean of its divisors is an integer number (63557118).

Almost surely, 2^211857055 is an apocalyptic number.

211857055 is a deficient number, since it is larger than the sum of its proper divisors (42371417).

211857055 is an equidigital number, since it uses as much as digits as its factorization.

211857055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42371416.

The product of its (nonzero) digits is 14000, while the sum is 34.

The square root of 211857055 is about 14555.3101993740. The cubic root of 211857055 is about 596.1391494912.

The spelling of 211857055 in words is "two hundred eleven million, eight hundred fifty-seven thousand, fifty-five".