21360870005 has 12 divisors (see below), whose sum is σ = 27229567620. Its totient is φ = 16083477504.

The previous prime is 21360869963. The next prime is 21360870043. The reversal of 21360870005 is 50007806312.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3765908689 + 17594961316 = 61367^2 + 132646^2 .

It is not a de Polignac number, because 21360870005 - 2¹⁶ = 21360804469 is a prime.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 7389860 + ... + 7392749.

It is an arithmetic number, because the mean of its divisors is an integer number (2269130635).

Almost surely, 2^21360870005 is an apocalyptic number.

It is an amenable number.

21360870005 is a deficient number, since it is larger than the sum of its proper divisors (5868697615).

21360870005 is a wasteful number, since it uses less digits than its factorization.

21360870005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14782648 (or 14782631 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 21360870005 in words is "twenty-one billion, three hundred sixty million, eight hundred seventy thousand, five".