21109363830 has 48 divisors (see below), whose sum is σ = 56917106064. Its totient is φ = 5629163040.

The previous prime is 21109363829. The next prime is 21109363859. The reversal of 21109363830 is 3836390112.

21109363830 is a `hidden beast` number, since 2 + 1 + 10 + 9 + 3 + 638 + 3 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4341061 + ... + 4345920.

It is an arithmetic number, because the mean of its divisors is an integer number (1185773043).

Almost surely, 2^21109363830 is an apocalyptic number.

21109363830 is an abundant number, since it is smaller than the sum of its proper divisors (35807742234).

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

21109363830 is an equidigital number, since it uses as much as digits as its factorization.

21109363830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8687003 (or 8686991 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The spelling of 21109363830 in words is "twenty-one billion, one hundred nine million, three hundred sixty-three thousand, eight hundred thirty".