21680566510 has 16 divisors (see below), whose sum is σ = 39032112672. Its totient is φ = 8670650400.

The previous prime is 21680566507. The next prime is 21680566513. The reversal of 21680566510 is 1566508612.

It is an interprime number because it is at equal distance from previous prime (21680566507) and next prime (21680566513).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21680566513) 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, 138426 + ... + 250045.

It is an arithmetic number, because the mean of its divisors is an integer number (2439507042).

Almost surely, 2^21680566510 is an apocalyptic number.

21680566510 is a deficient number, since it is larger than the sum of its proper divisors (17351546162).

21680566510 is a wasteful number, since it uses less digits than its factorization.

21680566510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394059.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 21680566510 in words is "twenty-one billion, six hundred eighty million, five hundred sixty-six thousand, five hundred ten".