21530200323 has 16 divisors (see below), whose sum is σ = 29261007776. Its totient is φ = 14078603520.

The previous prime is 21530200309. The next prime is 21530200327. The reversal of 21530200323 is 32300203512.

It is not a de Polignac number, because 21530200323 - 2⁸ = 21530200067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21530200323.

It is not an unprimeable number, because it can be changed into a prime (21530200327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231940 + ... + 311217.

It is an arithmetic number, because the mean of its divisors is an integer number (1828812986).

Almost surely, 2^21530200323 is an apocalyptic number.

21530200323 is a deficient number, since it is larger than the sum of its proper divisors (7730807453).

21530200323 is a wasteful number, since it uses less digits than its factorization.

21530200323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543414.

The product of its (nonzero) digits is 1080, while the sum is 21.

Adding to 21530200323 its reverse (32300203512), we get a palindrome (53830403835).

The spelling of 21530200323 in words is "twenty-one billion, five hundred thirty million, two hundred thousand, three hundred twenty-three".