21104456466 has 16 divisors (see below), whose sum is σ = 42217887744. Its totient is φ = 7033323024.

The previous prime is 21104456393. The next prime is 21104456479. The reversal of 21104456466 is 66465440112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343186 + ... + 399981.

It is an arithmetic number, because the mean of its divisors is an integer number (2638617984).

Almost surely, 2^21104456466 is an apocalyptic number.

21104456466 is an abundant number, since it is smaller than the sum of its proper divisors (21113431278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21104456466 is a wasteful number, since it uses less digits than its factorization.

21104456466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747905.

The product of its (nonzero) digits is 138240, while the sum is 39.

Adding to 21104456466 its reverse (66465440112), we get a palindrome (87569896578).

The spelling of 21104456466 in words is "twenty-one billion, one hundred four million, four hundred fifty-six thousand, four hundred sixty-six".