21306883500 has 144 divisors (see below), whose sum is σ = 76818530880. Its totient is φ = 4870137600.

The previous prime is 21306883487. The next prime is 21306883501. The reversal of 21306883500 is 538860312.

21306883500 is a `hidden beast` number, since 2 + 13 + 0 + 68 + 83 + 500 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21306883501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 306705 + ... + 369704.

It is an arithmetic number, because the mean of its divisors is an integer number (533462020).

Almost surely, 2^21306883500 is an apocalyptic number.

21306883500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21306883500 is an abundant number, since it is smaller than the sum of its proper divisors (55511647380).

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

21306883500 is a wasteful number, since it uses less digits than its factorization.

21306883500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676441 (or 676426 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 21306883500 in words is "twenty-one billion, three hundred six million, eight hundred eighty-three thousand, five hundred".