21302030323 has 4 divisors (see below), whose sum is σ = 24345177520. Its totient is φ = 18258883128.

The previous prime is 21302030263. The next prime is 21302030327. The reversal of 21302030323 is 32303020312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302030323 is a prime.

It is a super-2 number, since 2×21302030323² (a number of 21 digits) contains 22 as substring.

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 21302030323.

It is not an unprimeable number, because it can be changed into a prime (21302030327) 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 3 ways as a sum of consecutive naturals, for example, 1521573588 + ... + 1521573601.

It is an arithmetic number, because the mean of its divisors is an integer number (6086294380).

Almost surely, 2^21302030323 is an apocalyptic number.

21302030323 is a deficient number, since it is larger than the sum of its proper divisors (3043147197).

21302030323 is an equidigital number, since it uses as much as digits as its factorization.

21302030323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043147196.

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 21302030323 its reverse (32303020312), we get a palindrome (53605050635).

The spelling of 21302030323 in words is "twenty-one billion, three hundred two million, thirty thousand, three hundred twenty-three".