213243227 has 4 divisors (see below), whose sum is σ = 213566496. Its totient is φ = 212919960.

The previous prime is 213243211. The next prime is 213243259. The reversal of 213243227 is 722342312.

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 213243227 - 2⁴ = 213243211 is a prime.

It is a super-2 number, since 2×213243227² = 90945347722747058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213243196 and 213243205.

It is not an unprimeable number, because it can be changed into a prime (213243127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160643 + ... + 161964.

It is an arithmetic number, because the mean of its divisors is an integer number (53391624).

Almost surely, 2^213243227 is an apocalyptic number.

213243227 is a deficient number, since it is larger than the sum of its proper divisors (323269).

213243227 is an equidigital number, since it uses as much as digits as its factorization.

213243227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323268.

The product of its digits is 4032, while the sum is 26.

The square root of 213243227 is about 14602.8499615657. The cubic root of 213243227 is about 597.4364954128.

Adding to 213243227 its reverse (722342312), we get a palindrome (935585539).

The spelling of 213243227 in words is "two hundred thirteen million, two hundred forty-three thousand, two hundred twenty-seven".