21303564266 has 8 divisors (see below), whose sum is σ = 32120918724. Its totient is φ = 10596591360.

The previous prime is 21303564203. The next prime is 21303564277. The reversal of 21303564266 is 66246530312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21116449225 + 187115041 = 145315^2 + 13679^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27594905 + ... + 27595676.

Almost surely, 2^21303564266 is an apocalyptic number.

21303564266 is a deficient number, since it is larger than the sum of its proper divisors (10817354458).

21303564266 is a wasteful number, since it uses less digits than its factorization.

21303564266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55190776.

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 21303564266 in words is "twenty-one billion, three hundred three million, five hundred sixty-four thousand, two hundred sixty-six".