21320673368 has 16 divisors (see below), whose sum is σ = 40730532480. Its totient is φ = 10459198048.

The previous prime is 21320673313. The next prime is 21320673373. The reversal of 21320673368 is 86337602312.

It is a super-2 number, since 2×21320673368² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25141880 + ... + 25142727.

It is an arithmetic number, because the mean of its divisors is an integer number (2545658280).

Almost surely, 2^21320673368 is an apocalyptic number.

It is an amenable number.

21320673368 is a deficient number, since it is larger than the sum of its proper divisors (19409859112).

21320673368 is a wasteful number, since it uses less digits than its factorization.

21320673368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50284666 (or 50284662 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The spelling of 21320673368 in words is "twenty-one billion, three hundred twenty million, six hundred seventy-three thousand, three hundred sixty-eight".