21663662602 has 8 divisors (see below), whose sum is σ = 33908341536. Its totient is φ = 10360882092.

The previous prime is 21663662593. The next prime is 21663662617. The reversal of 21663662602 is 20626636612.

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

It is a super-3 number, since 3×21663662602³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235474548 + ... + 235474639.

It is an arithmetic number, because the mean of its divisors is an integer number (4238542692).

Almost surely, 2^21663662602 is an apocalyptic number.

21663662602 is a deficient number, since it is larger than the sum of its proper divisors (12244678934).

21663662602 is a wasteful number, since it uses less digits than its factorization.

21663662602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470949212.

The product of its (nonzero) digits is 186624, while the sum is 40.

The spelling of 21663662602 in words is "twenty-one billion, six hundred sixty-three million, six hundred sixty-two thousand, six hundred two".