21363520166 has 8 divisors (see below), whose sum is σ = 32257501104. Its totient is φ = 10611019800.

The previous prime is 21363520159. The next prime is 21363520187. The reversal of 21363520166 is 66102536312.

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

It is a congruent number.

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, 35369765 + ... + 35370368.

It is an arithmetic number, because the mean of its divisors is an integer number (4032187638).

Almost surely, 2^21363520166 is an apocalyptic number.

21363520166 is a deficient number, since it is larger than the sum of its proper divisors (10893980938).

21363520166 is a wasteful number, since it uses less digits than its factorization.

21363520166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70740286.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 21363520166 in words is "twenty-one billion, three hundred sixty-three million, five hundred twenty thousand, one hundred sixty-six".