211700055 has 32 divisors (see below), whose sum is σ = 389458944. Its totient is φ = 96189696.

The previous prime is 211700053. The next prime is 211700057. The reversal of 211700055 is 550007112.

It is an interprime number because it is at equal distance from previous prime (211700053) and next prime (211700057).

It is not a de Polignac number, because 211700055 - 2¹ = 211700053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211700053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11499 + ... + 23571.

It is an arithmetic number, because the mean of its divisors is an integer number (12170592).

Almost surely, 2^211700055 is an apocalyptic number.

211700055 is a deficient number, since it is larger than the sum of its proper divisors (177758889).

211700055 is a wasteful number, since it uses less digits than its factorization.

211700055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12255.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 211700055 is about 14549.9159791388. The cubic root of 211700055 is about 595.9918536715.

Adding to 211700055 its reverse (550007112), we get a palindrome (761707167).

The spelling of 211700055 in words is "two hundred eleven million, seven hundred thousand, fifty-five".