21064605326 has 8 divisors (see below), whose sum is σ = 31599812664. Its totient is φ = 10531334440.

The previous prime is 21064605313. The next prime is 21064605389. The reversal of 21064605326 is 62350646012.

It is a happy number.

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

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 456605 + ... + 500616.

It is an arithmetic number, because the mean of its divisors is an integer number (3949976583).

Almost surely, 2^21064605326 is an apocalyptic number.

21064605326 is a deficient number, since it is larger than the sum of its proper divisors (10535207338).

21064605326 is a wasteful number, since it uses less digits than its factorization.

21064605326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968226.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 21064605326 in words is "twenty-one billion, sixty-four million, six hundred five thousand, three hundred twenty-six".