21383078168 has 32 divisors (see below), whose sum is σ = 40361373360. Its totient is φ = 10620220800.

The previous prime is 21383078137. The next prime is 21383078179. The reversal of 21383078168 is 86187038312.

It is a happy number.

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, 1002818 + ... + 1023918.

Almost surely, 2^21383078168 is an apocalyptic number.

It is an amenable number.

21383078168 is a deficient number, since it is larger than the sum of its proper divisors (18978295192).

21383078168 is a wasteful number, since it uses less digits than its factorization.

21383078168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21947 (or 21943 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 21383078168 in words is "twenty-one billion, three hundred eighty-three million, seventy-eight thousand, one hundred sixty-eight".