21307000066 has 8 divisors (see below), whose sum is σ = 34866000144. Its totient is φ = 9685000020.

The previous prime is 21307000051. The next prime is 21307000087. The reversal of 21307000066 is 66000070312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21307000066.

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, 484249980 + ... + 484250023.

It is an arithmetic number, because the mean of its divisors is an integer number (4358250018).

Almost surely, 2^21307000066 is an apocalyptic number.

21307000066 is a deficient number, since it is larger than the sum of its proper divisors (13559000078).

21307000066 is a wasteful number, since it uses less digits than its factorization.

21307000066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968500016.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 21307000066 its reverse (66000070312), we get a palindrome (87307070378).

The spelling of 21307000066 in words is "twenty-one billion, three hundred seven million, sixty-six", and thus it is an aban number.