21803630328 has 64 divisors (see below), whose sum is σ = 61165360800. Its totient is φ = 7195910400.

The previous prime is 21803630327. The next prime is 21803630339. The reversal of 21803630328 is 82303630812.

21803630328 is a `hidden beast` number, since 2 + 18 + 0 + 3 + 630 + 3 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21803630292 and 21803630301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21803630323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477901 + ... + 521532.

Almost surely, 2^21803630328 is an apocalyptic number.

It is an amenable number.

21803630328 is an abundant number, since it is smaller than the sum of its proper divisors (39361730472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21803630328 is a wasteful number, since it uses less digits than its factorization.

21803630328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999549 (or 999539 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 21803630328 in words is "twenty-one billion, eight hundred three million, six hundred thirty thousand, three hundred twenty-eight".