211823065 has 8 divisors (see below), whose sum is σ = 254267208. Its totient is φ = 169405440.

The previous prime is 211823057. The next prime is 211823069. The reversal of 211823065 is 560328112.

It can be written as a sum of positive squares in 4 ways, for example, as 1108809 + 210714256 = 1053^2 + 14516^2 .

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

It is not a de Polignac number, because 211823065 - 2³ = 211823057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211823069) 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, 22969 + ... + 30841.

It is an arithmetic number, because the mean of its divisors is an integer number (31783401).

Almost surely, 2^211823065 is an apocalyptic number.

It is an amenable number.

211823065 is a deficient number, since it is larger than the sum of its proper divisors (42444143).

211823065 is an equidigital number, since it uses as much as digits as its factorization.

211823065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13259.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 211823065 is about 14554.1425374359. The cubic root of 211823065 is about 596.1072665888.

It can be divided in two parts, 2118 and 23065, that multiplied together give a triangular number (48851670 = T₉₈₈₄).

The spelling of 211823065 in words is "two hundred eleven million, eight hundred twenty-three thousand, sixty-five".