21266316005 has 32 divisors (see below), whose sum is σ = 30758807808. Its totient is φ = 13923712000.

The previous prime is 21266315999. The next prime is 21266316017. The reversal of 21266316005 is 50061366212.

It is not a de Polignac number, because 21266316005 - 2¹² = 21266311909 is a prime.

It is a Duffinian number.

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 31 ways as a sum of consecutive naturals, for example, 472946 + ... + 515955.

It is an arithmetic number, because the mean of its divisors is an integer number (961212744).

Almost surely, 2^21266316005 is an apocalyptic number.

It is an amenable number.

21266316005 is a deficient number, since it is larger than the sum of its proper divisors (9492491803).

21266316005 is a wasteful number, since it uses less digits than its factorization.

21266316005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988957.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 21266316005 in words is "twenty-one billion, two hundred sixty-six million, three hundred sixteen thousand, five".