21039133500 has 288 divisors, whose sum is σ = 82750187520. Its totient is φ = 4371696000.

The previous prime is 21039133487. The next prime is 21039133541. The reversal of 21039133500 is 533193012.

It is a happy number.

21039133500 is a `hidden beast` number, since 21 + 0 + 3 + 9 + 133 + 500 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 316141 + ... + 376859.

It is an arithmetic number, because the mean of its divisors is an integer number (287327040).

Almost surely, 2^21039133500 is an apocalyptic number.

21039133500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21039133500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41375093760).

21039133500 is an abundant number, since it is smaller than the sum of its proper divisors (61711054020).

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

21039133500 is a wasteful number, since it uses less digits than its factorization.

21039133500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60762 (or 60747 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 27.

The spelling of 21039133500 in words is "twenty-one billion, thirty-nine million, one hundred thirty-three thousand, five hundred".