21037319908 has 18 divisors (see below), whose sum is σ = 40466415878. Its totient is φ = 9562417920.

The previous prime is 21037319903. The next prime is 21037319911. The reversal of 21037319908 is 80991373012.

It can be written as a sum of positive squares in only one way, i.e., 20726785024 + 310534884 = 143968^2 + 17622^2 .

It is not an unprimeable number, because it can be changed into a prime (21037319903) 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 5 ways as a sum of consecutive naturals, for example, 21732285 + ... + 21733252.

Almost surely, 2^21037319908 is an apocalyptic number.

It is an amenable number.

21037319908 is a deficient number, since it is larger than the sum of its proper divisors (19429095970).

21037319908 is a wasteful number, since it uses less digits than its factorization.

21037319908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43465563 (or 43465550 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 21037319908 in words is "twenty-one billion, thirty-seven million, three hundred nineteen thousand, nine hundred eight".