21173322760 has 16 divisors (see below), whose sum is σ = 47639976300. Its totient is φ = 8469329088.

The previous prime is 21173322749. The next prime is 21173322883. The reversal of 21173322760 is 6722337112.

It can be written as a sum of positive squares in 2 ways, for example, as 19949302564 + 1224020196 = 141242^2 + 34986^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 264666495 + ... + 264666574.

Almost surely, 2^21173322760 is an apocalyptic number.

21173322760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21173322760 is an abundant number, since it is smaller than the sum of its proper divisors (26466653540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21173322760 is a wasteful number, since it uses less digits than its factorization.

21173322760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529333080 (or 529333076 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

Adding to 21173322760 its reverse (6722337112), we get a palindrome (27895659872).

The spelling of 21173322760 in words is "twenty-one billion, one hundred seventy-three million, three hundred twenty-two thousand, seven hundred sixty".