2185210823 has 4 divisors (see below), whose sum is σ = 2187291048. Its totient is φ = 2183130600.

The previous prime is 2185210777. The next prime is 2185210879. The reversal of 2185210823 is 3280125812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2185210823 - 2⁶ = 2185210759 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 2185210823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185210883) 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, 1038536 + ... + 1040637.

It is an arithmetic number, because the mean of its divisors is an integer number (546822762).

Almost surely, 2^2185210823 is an apocalyptic number.

2185210823 is a deficient number, since it is larger than the sum of its proper divisors (2080225).

2185210823 is a wasteful number, since it uses less digits than its factorization.

2185210823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080224.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 2185210823 is about 46746.2385973460. The cubic root of 2185210823 is about 1297.6705469169.

The spelling of 2185210823 in words is "two billion, one hundred eighty-five million, two hundred ten thousand, eight hundred twenty-three".