21063566344 has 16 divisors (see below), whose sum is σ = 39497256000. Its totient is φ = 10530964752.

The previous prime is 21063566323. The next prime is 21063566347. The reversal of 21063566344 is 44366536012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21063566297 and 21063566306.

It is not an unprimeable number, because it can be changed into a prime (21063566347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14989 + ... + 205795.

It is an arithmetic number, because the mean of its divisors is an integer number (2468578500).

Almost surely, 2^21063566344 is an apocalyptic number.

It is an amenable number.

21063566344 is a deficient number, since it is larger than the sum of its proper divisors (18433689656).

21063566344 is a wasteful number, since it uses less digits than its factorization.

21063566344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204612 (or 204608 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 21063566344 in words is "twenty-one billion, sixty-three million, five hundred sixty-six thousand, three hundred forty-four".