21464335566 has 12 divisors (see below), whose sum is σ = 46506060432. Its totient is φ = 7154778516.

The previous prime is 21464335537. The next prime is 21464335589. The reversal of 21464335566 is 66553346412.

21464335566 is a `hidden beast` number, since 2 + 1 + 4 + 64 + 33 + 556 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 596231526 + ... + 596231561.

It is an arithmetic number, because the mean of its divisors is an integer number (3875505036).

Almost surely, 2^21464335566 is an apocalyptic number.

21464335566 is an abundant number, since it is smaller than the sum of its proper divisors (25041724866).

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

21464335566 is a wasteful number, since it uses less digits than its factorization.

21464335566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192463095 (or 1192463092 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 45.

The spelling of 21464335566 in words is "twenty-one billion, four hundred sixty-four million, three hundred thirty-five thousand, five hundred sixty-six".