21204341066 has 8 divisors (see below), whose sum is σ = 32001644064. Its totient is φ = 10537126380.

The previous prime is 21204341057. The next prime is 21204341113. The reversal of 21204341066 is 66014340212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 32521670 + ... + 32522321.

It is an arithmetic number, because the mean of its divisors is an integer number (4000205508).

Almost surely, 2^21204341066 is an apocalyptic number.

21204341066 is a deficient number, since it is larger than the sum of its proper divisors (10797302998).

21204341066 is a wasteful number, since it uses less digits than its factorization.

21204341066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65044156.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 21204341066 its reverse (66014340212), we get a palindrome (87218681278).

The spelling of 21204341066 in words is "twenty-one billion, two hundred four million, three hundred forty-one thousand, sixty-six".