221533466 has 64 divisors (see below), whose sum is σ = 428212224. Its totient is φ = 83462400.

The previous prime is 221533441. The next prime is 221533469. The reversal of 221533466 is 664335122.

221533466 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221533469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 919106 + ... + 919346.

It is an arithmetic number, because the mean of its divisors is an integer number (6690816).

Almost surely, 2^221533466 is an apocalyptic number.

221533466 is a deficient number, since it is larger than the sum of its proper divisors (206678758).

221533466 is a wasteful number, since it uses less digits than its factorization.

221533466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435.

The product of its digits is 25920, while the sum is 32.

The square root of 221533466 is about 14884.0003359312. Note that the first 3 decimals coincide. The cubic root of 221533466 is about 605.0804400932.

Adding to 221533466 its reverse (664335122), we get a palindrome (885868588).

The spelling of 221533466 in words is "two hundred twenty-one million, five hundred thirty-three thousand, four hundred sixty-six".