21035324500 has 48 divisors (see below), whose sum is σ = 45955361088. Its totient is φ = 8411527200.

The previous prime is 21035324473. The next prime is 21035324501. The reversal of 21035324500 is 542353012.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035324501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2989987 + ... + 2997013.

It is an arithmetic number, because the mean of its divisors is an integer number (957403356).

Almost surely, 2^21035324500 is an apocalyptic number.

21035324500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21035324500 is an abundant number, since it is smaller than the sum of its proper divisors (24920036588).

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

21035324500 is a wasteful number, since it uses less digits than its factorization.

21035324500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13033 (or 13021 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21035324500 its reverse (542353012), we get a palindrome (21577677512).

The spelling of 21035324500 in words is "twenty-one billion, thirty-five million, three hundred twenty-four thousand, five hundred".