21289334008 has 16 divisors (see below), whose sum is σ = 39937500000. Its totient is φ = 10639334016.

The previous prime is 21289333981. The next prime is 21289334047. The reversal of 21289334008 is 80043398212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649633 + ... + 681616.

It is an arithmetic number, because the mean of its divisors is an integer number (2496093750).

Almost surely, 2^21289334008 is an apocalyptic number.

It is an amenable number.

21289334008 is a deficient number, since it is larger than the sum of its proper divisors (18648165992).

21289334008 is a wasteful number, since it uses less digits than its factorization.

21289334008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333254 (or 1333250 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 21289334008 in words is "twenty-one billion, two hundred eighty-nine million, three hundred thirty-four thousand, eight".