21331446466 has 96 divisors (see below), whose sum is σ = 36874341504. Its totient is φ = 9241689600.

The previous prime is 21331446463. The next prime is 21331446467. The reversal of 21331446466 is 66464413312.

It is not an unprimeable number, because it can be changed into a prime (21331446463) 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 47 ways as a sum of consecutive naturals, for example, 88512106 + ... + 88512346.

It is an arithmetic number, because the mean of its divisors is an integer number (384107724).

Almost surely, 2^21331446466 is an apocalyptic number.

21331446466 is a deficient number, since it is larger than the sum of its proper divisors (15542895038).

21331446466 is a wasteful number, since it uses less digits than its factorization.

21331446466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 477 counting only the distinct ones).

The product of its digits is 248832, while the sum is 40.

Adding to 21331446466 its reverse (66464413312), we get a palindrome (87795859778).

The spelling of 21331446466 in words is "twenty-one billion, three hundred thirty-one million, four hundred forty-six thousand, four hundred sixty-six".