21906303568 has 20 divisors (see below), whose sum is σ = 42481977408. Its totient is φ = 10943212640.

The previous prime is 21906303457. The next prime is 21906303569. The reversal of 21906303568 is 86530360912.

It is a super-2 number, since 2×21906303568² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21906303569) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 602998 + ... + 638293.

Almost surely, 2^21906303568 is an apocalyptic number.

It is an amenable number.

21906303568 is a deficient number, since it is larger than the sum of its proper divisors (20575673840).

21906303568 is a wasteful number, since it uses less digits than its factorization.

21906303568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242402 (or 1242396 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 21906303568 in words is "twenty-one billion, nine hundred six million, three hundred three thousand, five hundred sixty-eight".