213643633 has 8 divisors (see below), whose sum is σ = 244378368. Its totient is φ = 182962464.

The previous prime is 213643631. The next prime is 213643649. The reversal of 213643633 is 336346312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 213643633 - 2¹ = 213643631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213643595 and 213643604.

It is not an unprimeable number, because it can be changed into a prime (213643631) 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 7 ways as a sum of consecutive naturals, for example, 4441 + ... + 21142.

It is an arithmetic number, because the mean of its divisors is an integer number (30547296).

Almost surely, 2^213643633 is an apocalyptic number.

It is an amenable number.

213643633 is a deficient number, since it is larger than the sum of its proper divisors (30734735).

213643633 is a wasteful number, since it uses less digits than its factorization.

213643633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26783.

The product of its digits is 23328, while the sum is 31.

The square root of 213643633 is about 14616.5533899069. The cubic root of 213643633 is about 597.8101963599.

Adding to 213643633 its reverse (336346312), we get a palindrome (549989945).

The spelling of 213643633 in words is "two hundred thirteen million, six hundred forty-three thousand, six hundred thirty-three".