21308830636 has 24 divisors (see below), whose sum is σ = 37610496000. Its totient is φ = 10563093072.

The previous prime is 21308830633. The next prime is 21308830679. The reversal of 21308830636 is 63603880312.

It is not an unprimeable number, because it can be changed into a prime (21308830633) 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, 747501 + ... + 775483.

It is an arithmetic number, because the mean of its divisors is an integer number (1567104000).

Almost surely, 2^21308830636 is an apocalyptic number.

It is an amenable number.

21308830636 is a deficient number, since it is larger than the sum of its proper divisors (16301665364).

21308830636 is a wasteful number, since it uses less digits than its factorization.

21308830636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29613 (or 29611 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 21308830636 in words is "twenty-one billion, three hundred eight million, eight hundred thirty thousand, six hundred thirty-six".