21423567608 has 8 divisors (see below), whose sum is σ = 40169189280. Its totient is φ = 10711783800.

The previous prime is 21423567601. The next prime is 21423567611. The reversal of 21423567608 is 80676532412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423567601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1338972968 + ... + 1338972983.

It is an arithmetic number, because the mean of its divisors is an integer number (5021148660).

Almost surely, 2^21423567608 is an apocalyptic number.

It is an amenable number.

21423567608 is a deficient number, since it is larger than the sum of its proper divisors (18745621672).

21423567608 is a wasteful number, since it uses less digits than its factorization.

21423567608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677945957 (or 2677945953 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 21423567608 in words is "twenty-one billion, four hundred twenty-three million, five hundred sixty-seven thousand, six hundred eight".