213561466 has 8 divisors (see below), whose sum is σ = 320510484. Its totient is φ = 106724640.

The previous prime is 213561461. The next prime is 213561487. The reversal of 213561466 is 664165312.

It can be written as a sum of positive squares in 2 ways, for example, as 156875625 + 56685841 = 12525^2 + 7529^2 .

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

It is not an unprimeable number, because it can be changed into a prime (213561461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23115 + ... + 31006.

Almost surely, 2^213561466 is an apocalyptic number.

213561466 is a deficient number, since it is larger than the sum of its proper divisors (106949018).

213561466 is a wasteful number, since it uses less digits than its factorization.

213561466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56096.

The product of its digits is 25920, while the sum is 34.

The square root of 213561466 is about 14613.7423680589. The cubic root of 213561466 is about 597.7335475838.

It can be divided in two parts, 21356 and 1466, that added together give a palindrome (22822).

The spelling of 213561466 in words is "two hundred thirteen million, five hundred sixty-one thousand, four hundred sixty-six".