21660563124104 has 16 divisors (see below), whose sum is σ = 40666369335900. Its totient is φ = 10816197967872.

The previous prime is 21660563124091. The next prime is 21660563124121. The reversal of 21660563124104 is 40142136506612.

It can be written as a sum of positive squares in 2 ways, for example, as 19822993099204 + 1837570024900 = 4452302^2 + 1355570^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1760442737 + ... + 1760455040.

Almost surely, 2^{21660563124104} is an apocalyptic number.

It is an amenable number.

21660563124104 is a deficient number, since it is larger than the sum of its proper divisors (19005806211796).

21660563124104 is a wasteful number, since it uses less digits than its factorization.

21660563124104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520898552 (or 3520898548 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 21660563124104 in words is "twenty-one trillion, six hundred sixty billion, five hundred sixty-three million, one hundred twenty-four thousand, one hundred four".