21688580410 has 36 divisors (see below), whose sum is σ = 45420058638. Its totient is φ = 7434967008.

The previous prime is 21688580377. The next prime is 21688580429. The reversal of 21688580410 is 1408588612.

It can be written as a sum of positive squares in 3 ways, for example, as 4588572121 + 17100008289 = 67739^2 + 130767^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3256644 + ... + 3263296.

Almost surely, 2^21688580410 is an apocalyptic number.

21688580410 is an abundant number, since it is smaller than the sum of its proper divisors (23731478228).

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

21688580410 is an frugal number, since it uses more digits than its factorization.

21688580410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13327 (or 6667 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 43.

The spelling of 21688580410 in words is "twenty-one billion, six hundred eighty-eight million, five hundred eighty thousand, four hundred ten".