213224665 has 16 divisors (see below), whose sum is σ = 269752320. Its totient is φ = 161559360.

The previous prime is 213224647. The next prime is 213224699. The reversal of 213224665 is 566422312.

It is not a de Polignac number, because 213224665 - 2⁵ = 213224633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7350 + ... + 21919.

It is an arithmetic number, because the mean of its divisors is an integer number (16859520).

Almost surely, 2^213224665 is an apocalyptic number.

It is an amenable number.

213224665 is a deficient number, since it is larger than the sum of its proper divisors (56527655).

213224665 is a wasteful number, since it uses less digits than its factorization.

213224665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29352.

The product of its digits is 17280, while the sum is 31.

The square root of 213224665 is about 14602.2143868661. The cubic root of 213224665 is about 597.4191600627.

Adding to 213224665 its reverse (566422312), we get a palindrome (779646977).

The spelling of 213224665 in words is "two hundred thirteen million, two hundred twenty-four thousand, six hundred sixty-five".