213445233 has 8 divisors (see below), whose sum is σ = 316215200. Its totient is φ = 142296804.

The previous prime is 213445231. The next prime is 213445247. The reversal of 213445233 is 332544312.

213445233 is a `hidden beast` number, since 2 + 134 + 4 + 523 + 3 = 666.

It is not a de Polignac number, because 213445233 - 2¹ = 213445231 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 7905379 = 213445233 / (2 + 1 + 3 + 4 + 4 + 5 + 2 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213445197 and 213445206.

It is not an unprimeable number, because it can be changed into a prime (213445231) 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, 3952663 + ... + 3952716.

It is an arithmetic number, because the mean of its divisors is an integer number (39526900).

Almost surely, 2^213445233 is an apocalyptic number.

It is an amenable number.

213445233 is a deficient number, since it is larger than the sum of its proper divisors (102769967).

213445233 is an equidigital number, since it uses as much as digits as its factorization.

213445233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7905388 (or 7905382 counting only the distinct ones).

The product of its digits is 8640, while the sum is 27.

The square root of 213445233 is about 14609.7649878429. The cubic root of 213445233 is about 597.6250870503.

Adding to 213445233 its reverse (332544312), we get a palindrome (545989545).

The spelling of 213445233 in words is "two hundred thirteen million, four hundred forty-five thousand, two hundred thirty-three".