21769684810 has 16 divisors (see below), whose sum is σ = 39924781416. Its totient is φ = 8543574208.

The previous prime is 21769684693. The next prime is 21769684837. The reversal of 21769684810 is 1848696712.

It can be written as a sum of positive squares in 4 ways, for example, as 16453962529 + 5315722281 = 128273^2 + 72909^2 .

It is a super-2 number, since 2×21769684810² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20536909 + ... + 20537968.

Almost surely, 2^21769684810 is an apocalyptic number.

21769684810 is a deficient number, since it is larger than the sum of its proper divisors (18155096606).

21769684810 is a wasteful number, since it uses less digits than its factorization.

21769684810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41074937.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 21769684810 in words is "twenty-one billion, seven hundred sixty-nine million, six hundred eighty-four thousand, eight hundred ten".