21786964265 has 8 divisors (see below), whose sum is σ = 28521116928. Its totient is φ = 15845064880.

The previous prime is 21786964259. The next prime is 21786964267. The reversal of 21786964265 is 56246968712.

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

It is not a de Polignac number, because 21786964265 - 2¹⁴ = 21786947881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21786964265.

It is not an unprimeable number, because it can be changed into a prime (21786964267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198063257 + ... + 198063366.

It is an arithmetic number, because the mean of its divisors is an integer number (3565139616).

Almost surely, 2^21786964265 is an apocalyptic number.

It is an amenable number.

21786964265 is a deficient number, since it is larger than the sum of its proper divisors (6734152663).

21786964265 is a wasteful number, since it uses less digits than its factorization.

21786964265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396126639.

The product of its digits is 8709120, while the sum is 56.

The spelling of 21786964265 in words is "twenty-one billion, seven hundred eighty-six million, nine hundred sixty-four thousand, two hundred sixty-five".