21426848666 has 16 divisors (see below), whose sum is σ = 33020193024. Its totient is φ = 10420315344.

The previous prime is 21426848627. The next prime is 21426848689. The reversal of 21426848666 is 66684862412.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175811 + ... + 271593.

It is an arithmetic number, because the mean of its divisors is an integer number (2063762064).

Almost surely, 2^21426848666 is an apocalyptic number.

21426848666 is a deficient number, since it is larger than the sum of its proper divisors (11593344358).

21426848666 is a wasteful number, since it uses less digits than its factorization.

21426848666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98845.

The product of its digits is 5308416, while the sum is 53.

The spelling of 21426848666 in words is "twenty-one billion, four hundred twenty-six million, eight hundred forty-eight thousand, six hundred sixty-six".