21230340404 has 96 divisors (see below), whose sum is σ = 46154330880. Its totient is φ = 8370221184.

The previous prime is 21230340389. The next prime is 21230340407. The reversal of 21230340404 is 40404303212.

It is a self number, because there is not a number n which added to its sum of digits gives 21230340404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230340407) 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 31 ways as a sum of consecutive naturals, for example, 34633202 + ... + 34633814.

It is an arithmetic number, because the mean of its divisors is an integer number (480774280).

Almost surely, 2^21230340404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21230340404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23077165440).

21230340404 is an abundant number, since it is smaller than the sum of its proper divisors (24923990476).

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

21230340404 is a wasteful number, since it uses less digits than its factorization.

21230340404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226 (or 1198 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21230340404 its reverse (40404303212), we get a palindrome (61634643616).

The spelling of 21230340404 in words is "twenty-one billion, two hundred thirty million, three hundred forty thousand, four hundred four".