21037633108 has 24 divisors (see below), whose sum is σ = 37389449664. Its totient is φ = 10355136000.

The previous prime is 21037633103. The next prime is 21037633147. The reversal of 21037633108 is 80133673012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21037633103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404553 + ... + 453583.

It is an arithmetic number, because the mean of its divisors is an integer number (1557893736).

Almost surely, 2^21037633108 is an apocalyptic number.

It is an amenable number.

21037633108 is a deficient number, since it is larger than the sum of its proper divisors (16351816556).

21037633108 is a wasteful number, since it uses less digits than its factorization.

21037633108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50703 (or 50701 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 21037633108 in words is "twenty-one billion, thirty-seven million, six hundred thirty-three thousand, one hundred eight".