21366202684 has 24 divisors (see below), whose sum is σ = 40132659168. Its totient is φ = 9916945920.

The previous prime is 21366202673. The next prime is 21366202709. The reversal of 21366202684 is 48620266312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2147152 + ... + 2157079.

It is an arithmetic number, because the mean of its divisors is an integer number (1672194132).

Almost surely, 2^21366202684 is an apocalyptic number.

It is an amenable number.

21366202684 is a deficient number, since it is larger than the sum of its proper divisors (18766456484).

21366202684 is a wasteful number, since it uses less digits than its factorization.

21366202684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4304325 (or 4304323 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

Adding to 21366202684 its reverse (48620266312), we get a palindrome (69986468996).

The spelling of 21366202684 in words is "twenty-one billion, three hundred sixty-six million, two hundred two thousand, six hundred eighty-four".