21530534300 has 108 divisors (see below), whose sum is σ = 52550339688. Its totient is φ = 7647024000.

The previous prime is 21530534299. The next prime is 21530534369. The reversal of 21530534300 is 343503512.

It is a self number, because there is not a number n which added to its sum of digits gives 21530534300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 499610 + ... + 540990.

Almost surely, 2^21530534300 is an apocalyptic number.

21530534300 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 21530534300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26275169844).

21530534300 is an abundant number, since it is smaller than the sum of its proper divisors (31019805388).

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

21530534300 is a wasteful number, since it uses less digits than its factorization.

21530534300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41460 (or 41442 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 26.

The spelling of 21530534300 in words is "twenty-one billion, five hundred thirty million, five hundred thirty-four thousand, three hundred".