21662073265 has 32 divisors (see below), whose sum is σ = 29956423680. Its totient is φ = 14730185664.

The previous prime is 21662073263. The next prime is 21662073343. The reversal of 21662073265 is 56237026612.

It is a cyclic number.

It is not a de Polignac number, because 21662073265 - 2¹ = 21662073263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21662073263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2728732 + ... + 2736658.

It is an arithmetic number, because the mean of its divisors is an integer number (936138240).

Almost surely, 2^21662073265 is an apocalyptic number.

It is an amenable number.

21662073265 is a deficient number, since it is larger than the sum of its proper divisors (8294350415).

21662073265 is a wasteful number, since it uses less digits than its factorization.

21662073265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8581.

The product of its (nonzero) digits is 181440, while the sum is 40.

Adding to 21662073265 its reverse (56237026612), we get a palindrome (77899099877).

The spelling of 21662073265 in words is "twenty-one billion, six hundred sixty-two million, seventy-three thousand, two hundred sixty-five".