213540566 has 4 divisors (see below), whose sum is σ = 320310852. Its totient is φ = 106770282.

The previous prime is 213540559. The next prime is 213540577. The reversal of 213540566 is 665045312.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 53385140 + ... + 53385143.

It is an arithmetic number, because the mean of its divisors is an integer number (80077713).

Almost surely, 2^213540566 is an apocalyptic number.

213540566 is a deficient number, since it is larger than the sum of its proper divisors (106770286).

213540566 is a wasteful number, since it uses less digits than its factorization.

213540566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106770285.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 213540566 is about 14613.0272702134. The cubic root of 213540566 is about 597.7140480631.

Adding to 213540566 its reverse (665045312), we get a palindrome (878585878).

The spelling of 213540566 in words is "two hundred thirteen million, five hundred forty thousand, five hundred sixty-six".